I use/abuse my spoolgun prob more than anyone here. Somedays i run 6 spools of wire thru it in both steel and alum. So the other day when i had the horse trailer job my spoolgun quit feeding alum wire. After pondering the problem and adjusting the tension screw it dawned on me, my drive wheels/rolls are shot from welding all that steel wire. Lucky me i had a spare set and went right back to welding. No problems now and it welded great. Just thought i would pass this on. So if i weld steel anymore i plan on using the old wheels...Bob