I decided to learn to make a set of scales. I did not have any materials to make them from so I went to the hardware store to see if they had something I could use. And then, there it was, a 3" PVC plumbing pipe. I thought possibly at the tangent of the inside diameter there might be enough material to make a scale. Also the outside diameter already had a curve to it. So the idea became a reality, with a coping saw, a hack saw,a file, hand drill, lots of sandpaper, pins, spray enamel and elbow grease. take a look, enjoy,