Im at a loss for words. Something is seriously wrong with that switch. It were me Id give up on that. You need to get another
mod, or see if you can order new insulators, magnets or anything else that can be replaced.
It looks pitted and charred? ITs an accident waiting to happen. Sorry, but if it looked like that when you got it, the guy who sold it to you sold you something that he abused and its unconscionable to sell that off to someone. Its like sending someone a letter bomb addressed to "resident"
If it got that way from the sparking its needs to be tossed or you need to replace parts.