This is a fingertech-style power switch for combat robots. Tighten the screw to turn on and loosen to turn off. Dimensions are 7x13x12mm

It uses M3 screws instead of imperial weirdness. I designed it to use 1.6mm brass or copper plates as the electrodes. I've included the solidworks files so you can change the dimensions according to the sheetmetal you might have laying around.