With an overhand knot with draw-loop, the weight of the load the rope carries depresses the loop sufficiently to keep it in place until the load item is placed in its ___location. When no longer required the free end may be pulled and draw the loop through and so release the load.
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Tying onto
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a ring.

A free version is sometimes used as a stopper.
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Make an eye
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Pull through
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Tighten