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I'm looking for a knot similar to a sheepshank but adjustable and stable under load on both ends.
Think of two poles that have the two ends of a rope permanently attached to them but you want to shorten the rope in-between like you would do with a taut-line hitch. Obviously, you have no free ends for a taut-line. A sheepshank would at least shorten the rope mid-line but could not create tension like a taut-line hitch would.
I feel like there should be a knot for this but I haven't seen one like it yet. Any ideas?
If you are asked to learn to tie the Sheepshank, please request your
Troop Leader to eliminate this knot and replace it with something safe
and useful, e.g., the Alpine Butterfly Loop is an excellent way of
creating a loop in the middle of a length of rope and can also be
safely used to shorten a rope.
There are several methods for tying it. We devised the method that is
used in the animation. It is an improvement on other "hand-winding"
methods. It helps locate the loop: the second crossing of your hand is
near your fingertips and away from the other two turns. This helps you
to locate it, pick it up, and wrap it around the other two strands.
Setting the knot usually requires holding the loop in your teeth and
pulling both ends with your hands.
Form a bight in the standing end and use it to tie a Directional
Figure 8 Knot. Pass the tail round the hook below and through the
Directional Figure 8 Loop, and pull tight. Complete the knot with two
Half Hitches below the loop.
The basic sheep shank is pretty useless - but if you add a second half hitch to each end and have a decent sized loop out of each end it works great. This is not far off a redirect used by tree climbers... so is head and shoulderr s above the basic sheep shank.