Very tricky, to say the least. Be very careful. You don't want to ruin your games.
Strange story though: I once bought about 14 games from an old operator. They were classic solid state games, and had been stored in an unheated garage for about 25-30 years. The garage was leaking in one of its corners. Bad conditions for storing pins, right? Absolutely. But the strange thing was that all of the games -apart from the ones directly underneath the spot where it leaked- were in exceptionally good condition. Backglasses, cabinets and playfields.
