Vertical caving terminology and methods > Knots > Common knots
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A bend knot tied by threading, used to turn a length of string or rope into a loop (such as a prusik loop). Sometimes used as a way to join two ropes to make a longer rope, since it can work with ropes of different thicknesses - a figure of 8 on a bight can be added to one of the tails to provide something to clip a cows tail into. It is considered to be the best way to join ropes to make a longer rope, and tests as the strongest of all common bend knots. Very hard to undo after loading (nearly impossible using hands alone), so when used to join ropes, it is usually coupled with another knot tied with the fisherman's knot in its loop such as an alpine butterfly knot, with the other knot taking the load, and the double fisherman's knot only serving as an emergency backup. Made from two stopper knots, pulling against each other.
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