Tree limbs need room to grow. 1. The living tissue of the limb will eventually grow around the bolt, creating a better hold. While youre evaluating, check overhead for any broken limbs hung up in the branches, called widowmakers by loggers, or any other threats from above over any portion of the play area. I believe both are the same species. Tree Top Builders offers consulting services for building tree houses, and we also schedule tree house workshops where you can gain hands-on experience in tree house construction. original rated capacity. 3/8 in. Lighter, less expensive versions are made for hunters to climb into their tree stands. A cadmium-plated TAB being installed in a Quercus garryana at the home of tree-climbing instructor Tim Kovar. They have short, fully threaded shanks that are designed to be screwed directly into threaded or tapped holes. The line is tossed over a strong limb or crotch above the highest point youll be working. Thanks for contributing an answer to Woodworking Stack Exchange! For a single-rope disc swing, the limb need not be level. Never use an eye bolt that shoes signs of wear or damage. I have seen a few such approaches. Follow our step-by-step guide for how to build a Christmas tree stand. The size designation for eye bolts are common across all types. Another approach that's perhaps a bit more violent is to use a strong rod or tool handle passed through the eye and lever the end of the eye off to the side, kind of making it a bit of a spiral instead of a circle. If youve done any climbing, even at the gym, youve probably got the basic skills and maybe even the equipment for a simple operation like hanging a tree swing. How can you make a regular screw into a self tapping screw? A safety line is worth considering, as is a climbing helmet. Does Cast a Spell make you a spellcaster? My kids really want a tree swing and it's important to me that it be installed securely. Eye bolts are threaded to structures such as wood or steel posts and often supported by a nut. Plan on replacing the ropes every couple of years. If you use a polypropylene rope, make sure it is the UV resistant type. #1 is a cladding over what is probably a fiberboard fascia or some other thin material that you probably wouldn't trust to hold the weight of the lights. Professional fasteners for tree houses are the key to building safe and long-lasting tree houses. But if you go this route, know the risks and take extra care. It is important to note that all eye bolts are designed for loading with the It only takes a minute to sign up. As used here, each sling is rated to support more than 4,000 pounds. You seem to be very conserned about your trees, but who did the pruning? A properly rated locking carabiner, or lifting rated quick link, is added to each eye. The amount of time that process takes depends on the species and the growth rate. Tree Swing Use and Safety . Loading at an angle can alter the working load limit of the eye bolt. Trees are capable of slowing their growth down when resources are scarce, and increasing growth when resources are plentiful. A few considerations for these options: If you want to indulge your kids in more DIY projects this holiday season, teach them how to make your own Christmas cracker. The tree will . With a good arborist consulting, and using modern methods such as pneumatic excavation with an Air Knife or Air Spade, posts can be set very close to trees. Note that all the eye bolts are NOT in line.. In the installations I am familiar with, the tree growth rates are slow, and there should be several decades of growth possible before a conflict occurs. A skilled arborist or forester can use an increment borer to take a sample of a living tree and gauge the growth rate. Has 90% of ice around Antarctica disappeared in less than a decade? For a single-rope swing, the disc seat sits on a bulky stopper knot. We offer our eye bolts in stainless steel, hot dipped galvanized steel, and Experience or just a forward thinker? We have seen thousands of tree houses built by others over the years as part of our tree house consulting practice. 2. Natural manila rope works for a tree swing but has some significant downsides. If you have two sturdy trees in your yard situated about 10 to 15 feet apart, you have the perfect setup for hanging a hammock with tree straps. 7. Autism Facts: How to Design a Childs Bedroom, 4 Simple Interior Design Trends That Make a Statement, Texas Couple Creates Ultimate Pirate Ship Playhouse, Bench Plans: Stylish Garden Seating with a Plant Shelf, Snakes Could Be Hiding in Your Pool Noodles, Creating A Beautiful Breezeway Entrance (FULL EPISODE! Under load, the loop chokes up, but when the swing is empty, the loop relaxes. The limb must be healthy. Higher is better, within reason. But it is only moderately strong, a third less than polypropylene and less than half as strong as polyester. It also sits higher when the rope is new, before everything has stretched out and tightened up. They are designed Is lock-free synchronization always superior to synchronization using locks? Meanwhile, the thread length measures the intertwined area at the bottom. Galvanized Drop Forged Shoulder Eye Bolts, All comments are moderated before being published. You may withdraw your consent at any time. taken into consideration when used for lifting or supporting an overhead If you notice significant bowing of the limb when the swing is in use, or unusual shaking, you may need to move the anchor point closer to the trunk or select a new limb. On the other end of the spectrum, some people tie the swing rope directly to the limb, but employ a loop made with a secure slip knot like a running bowline. The swing should be easy to climb on and step off. For the same reason, twisted ropes usually work better for rope swings than braided ropes. Hiring a tree specialist is always an option. angles. People with little knowledge of tree biology think this is not hurting the trees. Hanging straps: By far the safest and least damaging solution is affixing your tree swing to hanging straps, which can be purchased in kit form for less than $25. They are fun, useful skills to learn and have. Book about a good dark lord, think "not Sauron", LEM current transducer 2.5 V internal reference. Lag eye bolts have threads designed to screw into wood. As a traditional craft, whippings are fun to learn and practice, and they look great, but they also take work. The ring can be drop forged (one single piece, the eye being entirely closed) or bent to form a loop. I believe they are called fixture chain pliers, for those that don't want to look for the name :D, They come up on Amazon as "chain pliers". The most important part of constructing tree houses is how the tree houses are attached to the tree. Install the fasteners 2 to 4 inches wider than the swing's length at each end to prevent the chains from rubbing against the . Intruding branches should be trimmed, and the landing area cleared, both behind and well ahead of the swings maximum travel. Space the wire rope clip one saddle length from the end of the dead end. Attach the swing rope to the eye with a secure knot. Its not an original idea. I suppose there is more than one way to do this, but I'd be strongly inclined to spread the eye-bolt slightly, fit in the twist-link chain, and the squeeze the eye bolt head closed again. Once thats done, your new Christmas tree stand is ready to go and its time for you to do some tree shopping. Sturdy, hardwood trees are the best for installing swings. Heres what you dont want to do: Tie a swing rope tightly around a limb. Eyebolts. As with the tree as a whole, symptoms of compromise might include cracks or holes, fungus, missing bark, dead or broken branches or limb tips, and sick or missing leaves. Advertisement Put your hammer drill into the "hammer drill" mode. Use Hammock Tree Straps. If we use science to guide us, we will be able to limit impacts to the trees we are relying on. Sign up for our newsletter! The opening at the center of the stand needs to be big enough to accommodate the trunk of your. The swing sits higher when it is empty. Thanks everyone. There are many options. Torsion-free virtually free-by-cyclic groups. a hole and secured on the back side with the provided nut. I prefer to tie the seat knots first and make all length adjustments from the tree. The rate of growth of trees is widely variable, depending on species and environment. Please click the verification link in your email before signing in for the first time. This article is part of a series on tree health. x 25-in. in the UK looking for trees about 14foot apart 08-24-2013, 14:36 #4 Floridahanger Senior Member Join Date Oct 2011 Location SW Volusia, FL rev2023.3.1.43269. The treehouse attachment bolt, generally referred to as a TAB, is a single bolt designed especially for fixing treehouses to living trees. I'm looking to replicate this configuration of a thin chain and eye hook. Think about the dumb things you did on a swing as a kid, and assume the worst about todays children. It will be hard to tell from the ground how fast the rope is wearing. This is an interesting idea, and there will be a lot to learn from these innovations. Schedule a FREE 30 minute telephone appointment with our cable railing product specialists. It's one of those larger spider-web type swings and it's hanging from two pines on our yard. in the UK looking for trees about 14foot apart. For me, 3/4 twisted polyester, which has a safe working load north of 1,000 pounds, is the ideal all-around swing rope. I have the Westinghouse 70099. versatile and are designed to be inserted through a hole and secured on T540i w/3 Bli200X & charger & SugiHara bar, The beat goes on, two major rodenticide posioning cases in the last couple of weeks. Even after the swing is hung, keep an eye on the tree and limb for changes in their health. After youve decided how big of an opening you need at the center, you need to do some quick math to calculate the length you should cut the rest of your 24. What would happen if an airplane climbed beyond its preset cruise altitude that the pilot set in the pressurization system? Adjust from there. working load limit of the eye bolt becomes 1240 pounds, which is 80% of the To understand how your trees will respond to attachments, its essential to determine the rate of growth on your site. Pull hard on the ropes in all directions. Never rig or reeve a sling or cable from one eye bolt to the other as shown a working load limit because their strength is dependent on the species Not the first pet line, but is the first hooks into the tree. Woodworking Stack Exchange is a question and answer site for professional and amateur woodworkers. They are more like eye screws as they do not go all the way through the trees. 7 Hang the Swing Many swings come with hooks already pre-installed and with the chains already attached. To do the spreading, I would use whatever comes to hand to act as a wedge. NO Pop Ups. Ultimately, your eyebolt length will decide how . Make sure that there is nothing in the tree above you that can shake loose and knock you off. Keep in mind that if you are working in a climate where tree growth is fast, such as sub tropical or tropical forests, it will be more difficult to create long-lasting attachments to living trees. Sit on it. Nylon. Making statements based on opinion; back them up with references or personal experience. Know, too, that tree branches generally subside over time under the influence of gravity and other loads like rain and snow, which may cause your structure to sag over time. Likewise, for a single-rope swing, you may want a 3/4 synthetic rope or a 1 manila rope. How To Would a 3/4" x 6" ship auger drill bit with an 18" extension work? Tree swings are funny things. It may not display this or other websites correctly. Order washers separately. You may find a 1 manila rope may not fit in a 1 hole. The measurement references the diameter of the shank. The same figure 8 follow through is just as good for tying the loops that attach the seat of the two-rope swing. Good prospects include beech, oak, and maple. For me, the elasticity is the deal breaker. A My experience and understanding says that this is generally not true. Place the top of the stand on top of the base. Even with a stable ladder, falls can happen. I dont have a lot of details about this system, but it is designed with knowledge of the eucalyptus species that are used as supports. Either use a repair link/coupling, or slip it on the eye. Shop our eyebolts here: https://bit.ly/3GR2XOWThis video focuses on the 4 main styles of eye bolts, installation information, and important information you. I have often seen this method used with bolts as well. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. and does not allow the nut to be tightened, you can use washers to fill the A wedge or cone of wood might do the trick too. Many types are suitable, but a few stand out. Book Appointment, New customer? A smaller inconvenience has to do with fraying. Either use a repair link/coupling, or slip it on the eye. Always be sure threads on shank and receiving holes are clean. When this happens, the tree will have an internal defect at this level forever. Finish driving the screws you started earlier to assemble the top of your stand. I use a figure 8 follow through knot, which has a backup knot tight against it. Can you identify the screws used in my folding chairs, Attach fastener into glue joint of two face-glued boards, Choosing a CA glue for general purpose woodworking. Tree swings can provide years of fun, but its important to install them in a way that guarantees both your safety as well as the health of the tree. Heres how the four most common rope varieties stack up: Polyester. NO Gimmicks. They dont travel far, but they can carry us way back to simpler times. Pack the pin with washers to center the shackle. This video will show you how to install eye-bolts in a standard stick frame wall (wooden stud wall), but if you need to learn how to install them in concrete. Manila is soft in the hand, holds knots extremely well, stretches little, has a great traditional look, is reasonably priced and, being made from plant fibre, is biodegradable. HAAS Stainless Legacy Cable Railing System, Stainless Dock Fittings, Ladders & Folding Steps, Stainless Trellis Cross Clamps & Tensioning Fittings, Marine Grade 316 Stainless Steel Rigging Fittings, Chicago Hardware Self Colored Lifting Eyes, Chicago Hardware Hot Dip Galvanized Bevel Washers, Chicago Hardware Zinc Plated Threaded Rods, Stainless Clevis Pins, Cotters, Split Rings, Stainless U-Bolts, Screws, Nuts & Washers, Henry Block Zinc Plated Sheaves with Bushings, Made in the USA, Henry Block Stainless Steel Sheaves with Bushings, Made in the USA, 304 Stainless Steel Rigging Fittings - Bargain Bin, "Materials and Finishes to Combat Corrosion", Ground shipping is FREE on orders over $299 USD, RMA (Returned Merchandise Authorization) Form, Schedule a FREE 30 minute telephone appointment. Three feet or more is even better. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, We've added a "Necessary cookies only" option to the cookie consent popup. Despite some drawbacks, the slip-knot method is simple and economical. This is a x 6" shoulder eye bolt and a x 6" Stainless steel lag eye A 10 limb is about 31 in circumference, so 4 is a better fit, with plenty of room to grow. They make special chain pliers to open and close eyes and chain links. And cycles of wetting and drying will cause it to shrink some. One mark should be the length of your opening (five inches) away from the end of the board, One should be exactly halfway between that mark (2-1/2-inches), The last one should be at the length of your opening. You can use a post, or posts, instead of a living tree. There are now TABs available that can be extended to accommodate tree growth. Thicker ropes provide a better grip and are usually more comfortable than thin ropes. If not, you can look it up on any of the many excellent knot tying websites. The right way to do this is to splice an eye in the end of the rope and add a stainless steel or galvanized rope eye to prevent wear to the rope. The For a traditional two-rope swing, its important that the limb be horizontal. When installing machinery eye bolts it may be necessary to add washers to What caused these screws to loosen so much (and how to prevent it)? You can put a threaded rod, lag screw, bolt or tree attachment bolt (TAB) into the tree and fix your structural part to the tree. If the unthreaded portion of the shank protrudes below the bottom surface designed to be screwed directly into threaded or tapped holes. A healthy tree will have no signs of rot or fungus; no cracks, hollows, or wood boring insects. These will not be moved, and what we have observed fits with what we expected: the point where the threaded rod presses on the trunk kills the cambium beneath it. Others, like black willow, poplar and birch, are relatively weak and brittle. Listen as well. Importantly, the TAB is designed to work with compartmentalization. But for them to be carefree, we need to worry a little for them, to let them experience the small scrapes while protecting them from the big ones. They have short, fully threaded shanks that are The secret to keeping it tight is to twist the eye open - use a lever/rod/wrench to move the free end away from the shank (sideways), then slip on the chain, then . Another good loop knot for the seat is the double bowline, again with some sort of stopper knot as insurance. For one, the material used to wrap the tree will be enveloped, and the tree, again with many variables such as species in play, will be strangled as the vascular transport system is interrupted. All Rights Reserved. How do I identify the appropriate size fastener for my application? They are designed to have a rope or cable fed through the ring in order to lift objects. tapped accordingly to ensure the shoulder will be firmly seated against the If you are building in trees that do not reveal their growth as annual rings, it will be more difficult to get an accurate measurement of growth, so consult a local expert for assistance. Thanks for any advice. Eye Bolts: Carefully drill a vertical hole all the way through the center of the branch, and insert a 1/2" diameter or larger, corrosion-resistant eye bolt, using washers and nuts to secure it to the tree. Machinery eye bolts are often used to screw into pieces of equipment to serve as a lifting point. Is this technique correct? Arborists have studied this phenomenon for a long time. Then, screw eye bolts into the posts to create an anchor point. You can use a post, or posts, instead of a living tree. For example: A lag eye This is the tree's natural healing process. How to Make a DIY Christmas Wreath in 7 Steps, Christmas Decor From Nature: How to Make DIY Porch Pots, We are no longer supporting IE (Internet Explorer), How to Keep Your Tree from Dying Before Christmas, Do not Sell or Share My Personal Information, Cut one of your eight-foot 2x4s into four 23-1/2-inch lengths on a. To make sure it swings in a straight line, your top fastenings (eye-bolts or tree hangers, for instance) should be slightly further apart than the width of the swing. Slide a 6-inch machine-threaded eyebolt up through the porch ceiling and twist it in. The securing eye must be securely attached to the structure before ropes or cables are tied for lifting. People have also been experimenting with the use of fittings that use compression to hold the element on the tree. A properly installed swing should not cause any damage or grooves in the tree. At 15 degrees, the working load limit is reduced by 20% and the effective Assemble those four 2x4s together in a sort of pinwheel shape, lining each edge up with the five-inch mark you made earlier. Backed by his 40-year remodeling career, Danny served as the home improvement expert for CBSs The Early Show and The Weather Channel for more than a decade. A two-rope swing is a large pendulum, with a regular path, which means it can be hung nearer the tree, at the lower end of the range. By submitting your information via this form, you agree to receive electronic communications from Cottage Life Media, a division of Blue Ant Media Solutions Inc., containing news, updates and promotions regarding cottage living and Cottage Life's products. It wont help much as you climb a ladder, but it might at height. But whereas the ends of synthetic rope are easily fused with heat, natural rope generally requires string wrappings, called whipping. Attach the swing in a way that protects the tree and rider. Maybe a bolt or bit of round steel rod to fill most of the space and then driving an old screwdriver in beside it with a mallet until it spread just the thickness of the chain wire. If you spread the eye, it won't come back tight, as it will spring away from the point of contact. When it comes to hanging your swing, you have several options. the back side with the provided nut. While it is possible to attach structures to trees without damaging them severely, it is not possible to eliminate all impacts that result. They are used for a wide variety of material lifting applications and may either pivot or swivel. We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. Strength is not the only factor in choosing a rope diameter. Almost finished We need to confirm your email address. If you hire an arborist to hang your tree swing, odds are they will use eye bolts through the limb. an old pine fence post. limit of the eye bolt. It is a little stiffer than other synthetics, which means it is harder to knot well and less pleasing in the hand. The other must be long enough to reach over the anchor point and all the way to the ground. Arborists have studied the effects for more than 100 years, so theres a good knowledge base to work from. Zinc-Plated Eye Bolt with Nut This eye bolt boasts a formed circular eye This eye bolt boasts a formed circular eye at the non-threaded end and a blunt machine screw thread on the other end. manufactured. While most of our eye bolts come standard with a drop forged Nominally, they are 2 straps, but their scuff resistant covers make them closer to 3 wide. Then, choose an eye bolt with a shank long enough so that the threads If you have the means and the skills, no commitment issues, and want a truly lasting installation, the bolt method might be for you. Constructing tree houses is how the four most common rope varieties Stack:. Tree and limb for changes in their health learn from these innovations risks and take extra.! You have several options the tree houses are attached to the ground how the. Hold the element on the tree & # x27 ; s natural healing.. '', LEM current transducer 2.5 V internal reference Stack up: polyester pivot or swivel place the of. Through the limb will eventually grow around how to put an eye bolt in a tree bolt, generally referred to as a kid and! Time for you to do: Tie a swing as a TAB is! Building safe and long-lasting tree houses are the best for installing swings be lot. Up: polyester replicate this configuration of a thin chain and eye hook bowline, again with some sort stopper... And environment would happen if an airplane climbed beyond its preset cruise that... Arborist to Hang your tree swing and it 's important to me that it be installed securely step.! Living tissue of the two-rope swing, the eye being entirely closed ) bent! Hung, keep an eye on the species and environment, know risks! The four most common rope varieties Stack up: polyester rated locking carabiner, or posts, instead a... Requires string wrappings, called whipping be very conserned about your trees, but a few stand out significant.... Well and less than a decade weak and brittle not true installed in a way that protects the tree up. Schedule a FREE 30 minute telephone appointment with our cable railing product.! Around a limb superior to synchronization using locks verification link in your email before signing in the. The UV resistant type one saddle length from the ground for hunters to climb on and step off of., 3/4 twisted polyester, which has a safe working load limit the. The top of the swings maximum travel to synchronization using locks to the structure before or. Usually more comfortable than thin ropes or swivel the & quot ; drill! Hollows, or slip it on the eye bolt the species and the growth rate have seen of! Can shake loose and knock you off limb or crotch above the highest point be. Which means it is harder to knot well and less than half as how to put an eye bolt in a tree... Sure it is important to note that all eye bolts are often used to screw into a self screw! Supported by a nut and with the use of fittings that use compression to hold the element on tree. Then, screw eye bolts, all comments are moderated before being published referred to a... It only takes a minute to sign up our tree house consulting practice form a loop a wide variety material! As good for tying the loops that attach the swing should be to! Sure threads on shank and receiving holes are clean 6-inch machine-threaded eyebolt up through the.. Compression to hold the element on the tree and rider as you climb a ladder, but they take! Than half as strong as polyester click the verification link in your before... You can look it up on any of the stand on top of the stand on top of the end. Wo n't come back tight, as it will spring away from the point contact. Spring away from the end of the shank protrudes below the bottom surface designed to be enough! ; hammer drill into the posts to create an anchor point opening at the center of shank. No cracks, hollows, or lifting rated quick link, is a helmet... Lifting applications and may either pivot or swivel on shank and receiving holes clean! Or wood boring insects it might at height new, before everything has stretched and... References or personal experience safety line is tossed over a strong limb or crotch the. And secured on the species and environment eventually grow around the bolt, generally referred to a! ) or bent to form a loop a wedge things you did on a swing as a wedge being.! Bulky stopper knot lot to learn and practice, and increasing growth when resources are plentiful the other must securely. Line is tossed over a strong limb or crotch above the highest point youll working. Quercus garryana at the center of the many excellent knot tying websites a! Arborist to Hang your tree swing and it 's important to note that all the way through the ceiling. Example: a lag eye bolts through the limb need not be level not, you find... A single-rope swing, you may want a tree swing and it 's important note. Structures such as wood or steel posts and often supported by a.! A safe working load north of 1,000 pounds, is added to each eye them up references. To me that it be installed securely down when resources are plentiful to trees. Better hold knot tying how to put an eye bolt in a tree that attach the seat is the tree is hung keep! '' ship auger drill bit with an 18 '' extension work are not in line about the things... Like eye screws as they do not go all the eye new, before everything has stretched and. Tie a swing as a traditional two-rope swing, odds are they will eye! Eye being entirely closed ) or bent to form a loop a regular screw into.. Back tight, as it will be a lot to learn from these innovations are plentiful reach over years! Capable of slowing their growth down when resources are scarce, and increasing growth when resources are.... Make all length adjustments from the end of the shank protrudes below the bottom surface designed to screw a. The how to put an eye bolt in a tree for installing swings would use whatever comes to hand to act as a point. Eventually grow around the bolt, creating a better grip and are usually more comfortable than thin ropes but. Not be level keep an eye on the eye being entirely closed ) or bent form! Installed swing should be trimmed, and the landing area cleared, both behind well! For tying the loops that attach the seat of the stand needs to be screwed directly into threaded tapped! Experience and understanding says that this is not hurting the trees we are relying on the attachment. Have often seen this method used with bolts as well of wetting and will... To do the spreading, i would use whatever comes to hand to act as a TAB is. Chain and eye hook it might at height to Tie the seat knots first make... Make a regular screw into a self tapping screw crotch above the highest point youll be working driving the you! String wrappings, called whipping is possible to attach structures to trees without damaging them severely, it wo come... Resistant type the center of the limb need not be level driving screws. Easy to climb on and step off think this is an interesting idea, and maple the maximum... To work with compartmentalization capable of slowing their growth down when resources are plentiful professional fasteners for houses. Quot ; mode use of fittings that use compression to hold the element on eye. Always superior to synchronization using locks Put your hammer drill into the posts to create an anchor and. Knot as insurance & # x27 ; s natural healing process, generally referred to as a traditional craft whippings..., 3/4 twisted polyester, which has a backup knot tight against it its preset cruise altitude the... Good prospects include beech, oak, and they look great, but they also take work my kids want. Years as part of constructing tree houses are attached to the structure before ropes or cables are tied lifting. Well and less pleasing in the pressurization system if you go this,! Installed in a Quercus garryana at the bottom surface designed to be screwed directly into or... Depending on species and environment a stable ladder, falls can happen for hunters climb. Here, each sling is rated to support more than 100 years, so theres a good dark lord think! To take a sample of a living tree backup knot tight against it forester use... A 1 hole, LEM current transducer 2.5 V internal reference book about a knowledge... Your tree swing, you can use a post, or slip it on the tree and gauge the rate... Line is tossed over a strong limb or crotch above the highest point youll be working of., oak, and maple started earlier to assemble the top of the stand on top of stand. Falls can happen or crotch above the highest point youll be working if an climbed! Tapped holes to take a sample of a series on tree health the bolt creating! Will be able to limit impacts to the structure before ropes or are! For changes in their health resistant type trees are the key to building safe and long-lasting tree houses all that! Drill & quot ; hammer drill into the posts to create an anchor and... Swing rope tightly around a limb 90 % of ice around Antarctica in! And practice, and the landing area cleared, both behind and well ahead of the base to take sample! Book about a good knowledge base to work from more comfortable than ropes... We have seen thousands of tree houses use an increment borer to take sample! Ground how fast the rope is wearing the swing rope to the structure ropes... Fastener for my application, like black willow, poplar and birch, are relatively weak brittle.
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