I cobbled a circle template for my plasma cutter from parts a had at the shop. The pivot point is 1/4" round stock that I ground a point on. It treads into a piece of 1/2" flat bar I cut done. The adjustment bar is 3/8" allthread, that is adjustable. My attachment point for the plasma cutter is a 1" copper split ring hanger.( I am a plumber by trade). All in all, it worked reasonably well for the first version.