Author: Trout's Staff
When welded loops became common place on the end of premium fly lines, the perfection loop went from being an obscure knot, to one that is a must have for fly anglers of all skill levels. Although some people dislike a loop-to-loop connection between their fly line and leader, I have found over the years that it’s benefits far out weigh any of its drawbacks. It is incredibly easy, fast and efficient to attach your leader, and it also is a pretty seamless connection that slides through your guides easily. The best part of this knot, it is incredibly easy.
Form a single loop by bringing the tag end behind the standing part of leader. The tag should be on the right-hand side.
Form a second, smaller loop in front of the first by bringing the tag end in front of and then behind the first loop. End with the tag on the right again. Keep the loops in place with thumb and forefinger.
Pass the tag end between the loops and hold in place.
Pull the second loop through the first loop with right hand. Make sure tag end does not slip out of position. Lubricate and tighten by pulling on second loop and standing part of leader. The knot works best when loop is kept small.