Following on from last edition’s loop knot with the same name, this month we look at the other version of the perfection loop; this version is a completely different knot, with a completely different purpose.
To tie the knot internationally known as a perfection loop, the knot-tier forms a loop with a second loop behind it, then the standing end is run between the two loops, and the second loop is passed through the first loop.
Also known as the ‘angler’s loop’, this knot is used to form a loop in the end of a leader. That loop in the leader can then be attached to a tippet (thus creating a quick change loop-to-loop connection for fly fishing) or the loop in the leader can be looped\attached to an eyed-sinker (such as when tying up a bottom-basher paternoster dropper rig)
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Form a loop at the end of the line by passing the tag end behind the standing line. Hold the first loop between a finger and thumb.

Form a second loop by taking a turn around the standing line with the tag end by wrapping the second turn round the finger and thumb.

Hold the two loops in place and then take another turn with the tag end around the line between the two loops, this time crossing on the topside of the second loop.

Hold the tag end in place and pass the second loop through the first loop, checking that the loop crosses over and traps the tag end. (If you are tying a large loop, such as in rope or cordage, you can reach through the first loop and grab the second loop

Lubricate and pull the loop up until knot jams tight by pulling on the standing end and the ‘new’ loop. Trim the tag end.