This simple Halyard Shackle Knot tightens on itself creating a round end that ensures the Halyard does not get stuck in mast sheave under load.
Once the halyard has been used under load it will be nearly impossible to undo the knot, the best option will be to cut the rope if you need to undo the knot.
It is a great knot to use when you are not in a position to splice as it is quick and easy to tie and will not come undone
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