I bought a tracer and the centerline tool a few weeks ago and finally got around to using them yesterday on my roll cage for my 62 Falcon. I was working on a very complex cope where the windshield a pillar bar meets the roof halo. I'm glad I found this tool. It made it so much easier...especially since I am working by myself!! 👍
It's called a tube tracer, contour gauge, profiler, tube notching tool. You can buy them or make them. Here is our website. www.centurialinc.com/tube-coping-tools