Vertical caving terminology and methods > Knots > Common knots
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A bend knot used as a way to join two ropes to make a longer rope, but with the ropes pulled in an unusual fashion. Sometimes used as a rigging knot for a pull-through without a Y-hang, where it might be used to join separate ropes (one for loading, and one for derigging the pull-through), while simultaneously jamming against an anchor in order to support the load. A far better knot than the flat overhand bend, which is also used for this purpose. When pulling the rope down the pitch, the knot can run over rough surfaces, and usually orients itself facing away from the surface, in a way that avoids snagging, which is why it is sometimes preferred over other bends. If the two ropes are of different diameters, then for maximum strength, the knot should be tied so that the thinner rope ends up making the turn closest to the neck of the knot, where the loaded ropes come out. This is shown in blue in the illustration. Made from a double overhand on a bight with the two tails replacing the usual loop.
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