Quoted from ZNET:Correct. Snip off the old mushroom bumper rubber. Clean the bumper.
Then, place a new rubber on any edge of the mushroom "disc." The best position is clear of any nearby structures both at the point of placement and at the opposite end.
You will say to yourself that the rubber is way too small to stretch over the disc and you will be tempted to abandon the task. Take a break and eat some bacon. Down it with a beer. Meditate for 30 seconds.
Return to the game.
Pinch each side of the rubber while it's positioned on the edge of the disc, as if you are trying to slip it on. Imagine that the rubber is 5 times larger. With
the thumbs of each hand on the top of each side of the rubber, push down firmly both around the edge laterally and also on top of the disc, while holding the back of the rubber in place.
This will cause the rubber to expand considerably. You will be surprised.
The disc will flex. Don't be scared. These mushroom discs are robust and unlikely to break. Just apply pressure evenly.
Pushing downward with your thumbs toward your body will cause the expanded rubber to "roll" and "twist" itself to the center where the diameter is greatest. As you roll beyond the diameter, the rubber will vigorously snap over the remaining disc and onto the stalk, on its own.
Essentially, you are rolling half of the rubber over the disc, causing the rubber to perform a somersault over the disc to reclaim its natural position. You are unleashing the inherent energy of the rubber's innate form. You are now successful and you have earned the title of zen pinball rubber master.
I have no idea if Bally intended this technique. However, I refuse to believe that Bally required the disassembly of the bumpers simply to change rubbers. After all, Bally designed the easy access elevating cabinet board and integrated glass canopy for ease of service. Bally was mindful of ease of service features.
Freaking awesome description of a mundane process!