See if this helps
a picture speaks a thousand words.
All the tools, A C&F Knot tool, Snips, superglue, leader and fly line
Stick the needle into the tip of the fly line for a 1/2"
Feed tippet end of leader into knot tool
Pull leader right through until loop hits fly line
Rough up the 1/2-3/4" of the end of the leader
Brush roughed up part with super glue and pull into end of flyline until all roughed up portion is covered.
Snip Loop off flush with Flyline and wipe excess super glue over the Cut and the joint and then hold straight with a little pressure for 30secs to a min for the superglue to set.
Once it is set it should look like this, and you should have only removed about this much of the leader
I needed a new leader for my nymph rig anyway
Hope that helps
Cheers
Sandy