The Non Slip loop Knot is simple to tie and it won't slip.
The loop allows the fly free movement in the water. This is
especially beneficial for flies with a lot of motion, such
as the Spoon Fly.
Make a simple over hand knot, leaving about 6 inches towards
the tag end.
Pass the tag end through the eye of the hook and then into
the loop and out again. Note that the tag and standing end
and also the loop pass through the over hand knot in the same
over and under direction.
Make 4 wraps with the tag end around the standing line. Then
put the standing end through the over hand knot as illustrated.
Lubricate, then pull the standing end and the fly to tighten.
As the knot tightens snug up the tag end.