For those wondering about Cliffy-type protection on the playfield:
There are Cliffy-type protectors around the mine shaft entrance, the ramp entrances and the ball exit/trough. The shooter lane/ball eject and both sides of the saloon entry (Bart target) may need protectors. Factory installed Mylar is around the bad guy drop targets and switches at ramp ball drops; those areas may need Cliffys too.