I have a 330A and would like to use it as a spot welder. The welder has the timer on it. I do body work and figured there might be a way to use it for this function. What I would like to due is set up so I can tack washers on end on sheet metal so I have the ability to pull out dents, then twist washers to break weld. So I want to clamp a washer on on electrode, press against sheet metal, and use pedal to start timer to tack weld. What connections and settings do I need to set up machine to do this?