How to join two pieces of rope in an adjustable tight loop?
I'm looking to use a piece of paracord as a ridge/sag line in my hammock setup, to do this I want to be able to tie the two ends together in a fashion that will allow me to alter the length of the loop easily but to lock in place - this knot will be taking my weight and my gears overnight so it needs to be solid.
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I'm not sure how your setup is, but I'd try a Purcell prussik or something similar.
You must test its holding Power on paracord yourself, but on climbing cord it's solid enough.
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There are multiple ways to do what you're looking for. One way I solve this problem is with a metal ring. You attach a fixed knot on the ring, pass one end of the rope through one loop of the hammock, wrap the rope 3-4 times through the ring and then a fixed knot on the other loop of the hammock. Slide the ring up and down the ridgeline to adjust the size.
Dutchgear has an image of this setup.
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The type of knot you are looking for a called a friction hitch, or a slide and grip knot which is a kind of knot used to attach one rope to another in a way that is easily adjusted.
There are many different ways to tie a friction hitch:
And of course the Purcell Prusik, but the Purcell Prusik was developed for ascending ropes and doing rescue work, it may be a bit complicated to your purposes.
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