Mr. Pinball Tip:

Bally mushroom rubbers must be the least replaced rubber ring on all pinball machines. They are a bit of a bother to change, but are well worth replacing.

These rubber rings are 7/16", which size is rarely used elsewhere.

To change them, raise the playfield and undo the large nut that holds the assembly on the playfield. When the nut is fully unscrewed, remove the assembly from the top of the playfield while holding the nut in place. When the assembly is fully extracted, then the nut will slide out from under the switch easily.

Examine the assembly and note that at the bottom is a tiny E-clip. Remove that clip (needle-nose pliers do this well), and remove the brass ring and spring inside the end. Lift out the mushroom lifter plastic from the top end. Now you can easily remove the old rubber ring and replace it.

When reassembling be certain to first slide the large nut behind the switch, and then lower the completed assembly back into the playfield. Be sure to only tighten the nut finger tight. It does not need to be any tighter, and will ensure that the next time the rubber is replaced it will be easy.
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