I repare all the welders at work, so friday I got to thinking. Why can't I convert my Stick welder to a Mig welder (spool gun), then back again? As I was looking at it, Both welders are just D.C. power sources. It's just a mig has a relay inside to cut the positive lead, and the stick is hot at all times. If I use a spool gun I would just need a small 24 VDC power source for the motor and controls. I could build it in a box with a relay to kill the positive when the trigger is not pulled. If I made it all separate then it would be able to go from stick to mig by switching the different positive leads. The gas goes right from the mig gun to the tank. Any ideas?