A mech that had a 510 positive pin that was smaller in diameter than the inner surface of the outer atty 510 casing would not short. All others, yes.I know from experience that the STM can recess past the outer casing back into the AFC base if over tightened. That would cause a short on the mech, no?
EDIT: Actually, all mods that had such a pin, it does not have to be a mech. If the 510 pin in the mod is fat enough to contact the 510 negative on the atty, it will short there. Period. It's just a regulated is supposed to sense that and not fire.