Maybe its common, and an easy fix (so I hope). I have a blue star 185, that runs great. Problem is that it welds wide open (180+ amps) all of the time. It will not adjust. I have tested the rheostat and it seems to check out fine. Should I just replace it? Any one have any ideas? Can I get one from an appliance store, or does it have to be from miller? Has anyone else had this problem? I'll post serial # when I get home tomorrow.