This is universal and can be used at sea and in climbing and camping. Poldo tackle is a truly ingenious device; thanks to the fact that it runs on a closed loop, it is self-locking.
Make a bowline at one end of a rope. Run the other end through the loop of the bowline; then tie the end on itself with another bowline. The photographs (1, 2, 3) show the minimum and maximum extensions of the knot.
N.B. Man-made ropes should not be used forthis knot by climbers.
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