Thanks for the tip. A couple more questions regarding the same machine:

When I hit Disaster Drop, the animation plays for a ball lock, but does not award one. Any idea what that is all about? Not really a huge deal, but when it thinks a ball has been locked it tries to plunge... nothing.

The first and most prominent problem we had was the ball getting stuck when being fed to upper right flipper. It seemed to be getting stuck between the plastic and wood of the upper playfield, right after being plunged from No Way Out.

Thanks for the help!

I like the idea of the Cliffy protector, although it seems that the ball also gets stuck on the plastic part of the ramp, almost on the lower screw. I assume that just tightening those screws as much as possible will help that. Any tips one the best way to get to those screws without taking too much apart?