Originally Posted by fan boy
it's the sp135...it's just rebadged the 3500 for home depot- the other difference i found is the heat setting switch---its uses the A,B,C,D settings, instead of the infinitely adjustable one--i have learned to hold the gun further away if it gets too hot.
Nice. I picked up an old ass SP-100 from eBay a while back. Finally got around to fixing it. Just needed a new front gearbox housing. Had to get a new gun, as it still had the original which used the old cam-style contact tips that you can't get anymore (which the last owner put in backwards!), and the liner had about 3 sharp bends in it. It made terrible welding before. Now it's very smooth. Has infinite adjustable speed and voltage. That little thing is a beast for only being on 120v. Quite happy with it.