Pinball machine leveling? There’s an app for that too, download it here: https://itunes.apple.com/de/app/pinguy/id782973821?mt=8
Thou shalt turn thy machine off when moving parts of it. One of the most common “problems” when working on pinball machines is the tendency to pick up the playfield while the game is powered on. Most of the time this can be harmless, but there’s always that off-chance that a wire or solder joint can brush against a side rail, or a screw, nut or other playfield piece comes loose and shorts an electrical connection. if you need to pull the playfield up, power down the machine, lift the playfield, then turn the power on.