The other material I was considering was tool-dip. I forget the proper name for it. But it is this rubberized material that you find on the ends of pliers and hand tools. You take a metal part and dip it in this substance, it comes in colors like yellow and red, and when it cures it is a soft and durable material. That would be perfect, except the clearance is to tight.... if only I had some spare handles to experiment with.

Calvin