After moving the game to a clear-coated reproduction (CPR) playfield, the star rollover buttons stick down, don't spring back, or fail to register.

Star rollovers stick after a reproduction playfield swap: clear coat in the openings

Cause: Clear coat has run into the star-shaped openings of the rollover inserts. Even a thin layer stops the button sliding freely; the opening needs to be almost free of clear.

Checks

• Remove a rollover button and look inside the star opening for clear coat on the walls.
• Check that the button moves up and down freely by hand with the switch removed.

Fix

• Carefully clean the clear coat out of each star opening with a sharp blade or a small fine file until the button slides freely, without chipping the surrounding clear.
• Refit the buttons and adjust the rollover leaf switches so they make contact reliably without holding the button up too high.

Systems

• Bally MPU AS-2518-35

Games

• Strikes and Spares

Related tips

• Fresh clear coat: cut it back around screw holes so it won't crack or lift

Source: Pinball Repair help group!! (Facebook group)