This might sound a bit odd or overkill, but put a few dabs of hot glue on the back and or front of the screws after getting everything setup correct. The hot glue will help keep the screws from working their way loose over time form the vibrations of the game. Hot glue is easy to peel off at a later date if you need to remove the screws.

I would not use crazy glue. Sometimes more is not better. Crazy glue might be hard to get off at a later date, you might get it on other things, and it might not work as well anyway because it does not give like hot glue. Hot glue has a rubber like consistency, so it absorbs the vibrations of the mech, and it is not all that difficult to remove later without a trace.

I had the same issue. You definitely can over tighten the switch to the point that it does not work. I had to find a happy medium. I am confident in the hot glue method. In fact I only have one of the screws holding the switch on right now, because I was unable to find it and have not had a chance to make it to the hardware store.

I used the same hot glue method for my XMENLE to keep the screws in the center ball lock up posts. One of the up posts would shoot straight at the glass every time the screw would loosen and fall out. A little dab of hot glue cured that as well.