If you know what you're doing, taking them apart and cleaning things up and adjusting them can, in the long run, be a positive.

But that's if you know what you're doing. If you don't, leave it alone.

The ones that are truly intimidating are games like Grand Prix. That's one that I really don't want to deal with and have not taken it apart. When I do a full restoration I usually clean up every relay and switch, even the score motors, but that one is one I just am scared to death to deal with. So I just play it.