Invention prototype -- help please with bent half tube... Hi all, I am in the prototype phase of an invention and I need part that I can't get made and was looking for a few ideas. As you can see the part is double-curved 16 gauge sheet metal. I brought it to a sheet metal shop and the guy told me it would cost an arm and a leg for 1, let alone the 4 I need. I started thinking I could find a 90 degree elbow of some sort and cut it in half. Any ideas?