Thanks Sonny. What I was leaning towards is the use of the tubing, IE: shrink wrap, to be the device holding the legs in place. Knowing that it's thread answers my Q. I've played with silicone and rubber some, and find that the diameter of the legs to be everything in the combination. I like the action of the silicone much better over the rubber. I've never tied for gills on little jigs so this is a lesson for me. Thanks for your patience.