Thanks, Mike,
A built up thread head coated with UV resin.
I discovered a long time ago the "squirmy leggy stuff" was actually what they call spinner bait skirt layers used in making spinner baits on the dark side, and found that they had more and better colors in lure making catalogs and much cheaper. On smaller ones I still use the skirt layers, but on these, they're tied on 3/0 hooks, I used a full spinner bait skirt which I brought from a catalog already made. Once I finish the underbody, I can just slide it on and glue it in place, then build up the thread head in front of it.