Now were can i get a spot welder like that : 
Rob
It looks remarkably like a dental spot welder but the average garage repair shop uses them.
Years ago I bought one. Made the legs out of earth copper rods and turned the electrodes out on the lathe.
There' s even better stuff which does seam welding with wheels. Does shock absorbers.
My wife used a dental one with a four head turret to do orthodontic work using stainless steel wires and bands.
Sort of 'What's new?'
