Simple plasma torch circle guide

[Frank S]

I needed to cut a circular piece of 10ga today and didn't want to use my cutting torch so I decided to make a circle guide for the plasma torch.
It is a simple tool made of a thin piece of round tubing some 1/2" sq tube a heavy 5/8" nut a couple of 1/4- 20 bolts and a magnet
I heated the nut to red hot then drove a square punch through it then cross drilled and treaded it to attach the magnet and a locking screw.
the round tubing had to be bored to fit the plasma torch then was welded to the sq tubing.