I am starting to think about a small DCTC, and cap-discharge experiments. What I'm looking for is a mechanical method to bring 2 electrodes close to let it arc. Maybe a brass knob on a pneumatic selenoid? I don't want to be holding *anything* with wires while doing this. I could just set the 2 knobs the proper distance for the voltage, but I would like a bit more control. Any help is appreciated. Caio! Shad sundog-at-earthling-dot-net