This knot is used for splicing a spey line for loop to loop tips or customizing the rear of a scandi head or front of a skagit amongst other uses.  It is also used a lot on shooting heads of all kinds.

1. The loop is made out of 50 lb braided mono.
2. Splice it back into itself and then braided handcuff over the end of the fly line, sink tip, etc.
3. Then do 2-3 nail knots with 10-12 lb maxima or floro.
4. Then trim flush the braided mono ends.
5. A thin bit of glue to cover the knots and the spot where the fly line terminates within the loop.   Note: You do not want to glue over the rest as it needs to have the handcuff effect.

Illustrations by Greg Pearson