After quite a few mount, disassemble, and clearance checks, we burned the new mounting tubes home with our Lincoln Electric Power MIG 255. While making sure we had good penetration, we had neglected to double-check the settings and accidentally burned through one of the tubes welded to the frame. Whoops. Talk about good penetration! We run 0.035-inch wire and a 75/25 gas mix when we are doing structural or frame work.