I need to make a small (6" x 4") compound curve patch panel for my '51 3100 cab corner. I could buy a whole panel, but don't want to cut it all out for that small piece. And, I'm afraid I couldn't cut exactly the right piece out of the patch. Anybody know an easy way to form the curve without a wheel? I could beat it around a steel ball, I guess, but don't have one of those either. Thanks!