Lots of great ideas have sprung up here, but maybe we’re getting a little too complicated. I have had a little luck with a small strip of cotton fabric such as from a cotton T-Shirt. Sure its a bit of a pain to wrap, but you are also adding a layer of protection from the clamp and the skin. A layer also gives you more thickness for the clamp to operate (know what I mean?) I may not be saying that too clear. Has anybody every tried gluing some felt material to a clamp, that might make the clamp a little softer. Anyway, my two cents.