Double posting, but I have to add one more thing -- it's also a great idea, really creative. You can't carve relief on the back of a bow, but by adding rawhide to cover a handle swell in back, and burning/incising, you've opened that possibility up. You've kept it local where the weight won't hurt performance and actually strengthened the handle back. Everything about it is smart. I like it very much. Good on ya!