Use this loop knot to tie your fly on and leave it loose for maximum action. As the name implies, once you’ve eased the knot tight, unlike the Duncan Loop, this loop cannot be adjusted. The Non-slip Loop works well with nymphs, streamers, and hair bugs.
First tie a half-hitch in the line, then pass the tippet through the eye of the hook. Pass the tip of the line back through the half-hitch so it points up the standing line. Make four wraps around the standing line and pass the tippet back through the half-hitch in line with the previous pass. Pull slowly the standing line and waste end to ease the knot tight.