I tie them on with a polyester thread & cement it with clear lacquer.
The bait keeper is a single strand from a fiber weed guard bent and tied around the shank of the hook with the same material/finish. The result is two plastic barbs protruding ~1/8" at ~45 degrees, the ends of which are enough to bite into a soft plastic and keep it secure.
Been playing around with bucktail combinations by request. Pretty happy with how the first one with the internal silicone for highlighting/flash only came out - the other is really just a std. chatterbait with bucktail for the body in place of a soft plastic.
Currently working on a mold to be able to make them in arky style heads (as shown) all the way up to 1oz on a 6/0 hook. Right now I have arkies in sizes 3/8 & 1/2, then footballs in 3/8, 1/2, 3/4 & 1oz.
Some recent creations for online orders before I attach their blades. The top green one pictured is from my new 1oz mold, and the blue/black is from the new 3/4oz mold. Both use either a 5/0 or 6/0 hook.