The "Chinese finger trap" does work. Try putting about 6 inches of braid over the end of a fly line. Grip it lightly at the end of the braid, 6 inches from the end of the fly line, then try to pull the braid off the fly line. By gripping it lightly at the end, you make the braid compress around the fly line and grip it tightly along the entire length. This is the purpose of the nail knot at that end. If you put a nail knot at the other end, near the end of the fly line, you are really only gripping the fly line with that nail knot. The only adhesive that I recommend is on the nail knot at the end of the braid to make sure that the knot stays put.

Ted