I have an older Craftsman MIG welder (Model #934.20111) and it has an issue wherein it will strike an arc but the wire feed stops as soon as it sparks and it just burns back to the tip. This happens no matter what wire feed speed you choose, nor is it sensitive to output power settings either. I am thinking it is the speed controller (My neighbor looked at it and said it is probably the problem), but it is $138 from Sears and I don't want to spend that kind of money if it is not the problem. I need to fix it so that I can finish the floor on my Cutlass. I broke my neighbors old welder that I was borrowing ( A Clarke Weld 100E Mk2) and if we get it working again, I do not wish to borrow it again because I am a hack and don't like breaking other people's stuff. I'd rather break my own stuff than inconvenience someone else by breaking theirs-especially since I can't afford to fix it right away! Besides, It would be cool to own a welder that actually works for once...