Learn how to tie the sheep shank Boy Scouts knot. A sheep shank knot has two uses. First, you may use it to shorten a rope and maintain its strength for pulling. Its most useful purpose, however, is in situation when you cannot retrieve your rope. When lowering yourself over a rock (with no intention of returning up the face) how are you going to retrieve the rope that it tied to a rock or tree at the top? Tie a sheep shank knot close to the top end of the rope. Maintain tension on the rope and clip the center strand inside of the knot. Lower yourself. At the bottom, give the rope a flip and the sheep shank comes lose, leaving only a short piece at the top. I never have had the self-confidence to lower myself over a cliff with a sheep shank, but I have used one while crossing a swift, deep creek and I was darned glad to know how to use a sheep shank.
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