This is my Sigelei #19. When it arrived it qualified as the most monumental piece of garbage that I had ever seen. This was to mechs what the yugo was to automobiles. We are talking misfires, inconsistent hits, searing heat from the button. I literally almost dropped it the first time I used it as the button felt like it was burning me. After trying several simple fixes that I saw on ECF, without the desired results, I gutted the switch and started from scratch. Parts incluide: piece of 3/4" brass barstock for the button, 4mm X 8 countersunk brass screw, 10mm brass standoff, 4mm copper plated brass tattoo machine contact screw, small section of copper tubing, 2 brass 6mm washers and 2 copper washers. Now it hits well enough to enjoy it, it's consistent with no misfires and no button heat. For the love of the game I was going to make this work but its my first and last Sigelei mech. Don't buy one if you don't want to fix it.