MercuryMac
Builder Junky!
Before I got a spot weld drill bit, I made a spot weld chisel. I started with a muffler removal chisel and cut a notch in it where a ridge had been in the middle. It worked O.K. if you weren't going to save one of the pieces of tin, because it bulged the tin a bit. The muffler chisel had a heel in it so it helped by keeping hammer away from the tin wall.