Eastwood's Plasma Cutting Guide
Product Review (submitted on February 16, 2013):
I found that if you are cutting out circles, you must move in a counterclockwise direction. Otherwise(as slag builds on the bottom side of the center rotating ring) the unit rotates as a whole and unscrews the outer nozzle allowing the electrode to lower and touch workpiece, thereby burning up the electrode and inner nozzle. Aside from that it works as advertised.