Marlborough, MA
The reason why those inserts pop up is Williams made the holes where the inserts go too small/tight. Over time, the wood squeezes the inserts up. Best to remove the inserts and take a dremmel with a sanding attachment and hone out the openings slightly then re-glue them back in. If inserts are cupped as well, can wet sand the surface of them flat then glue back in.
Hope that helps!
Dave (Doc)
www.pinballdoctor.com
Quoted from johnvorwerk:I have a High Speed that I am working on with the same thing now.
The inserts sometimes get hot and get disformed from #44 or even #47 lamps. Sometimes you can push them back down but they probably won't stay there. They are glued in originally, but the glue often fails with time. If you can push them up out of the playfield, you can re glue them, they are about a 1/16" thick in the center. I have taken them out and heated them with a heat gun, and while still warm pushed them on a hard flat surface face down to get some of the cupping out. Then I rub them face down on sandpaper to get them flat and back in plane. I then glue them back in flush with the playfield. Then sand the entire playfield again to get them exact. Clear coat with a spray bomb to get a good surface for the overlay to stick to.
The process can be alot of work, but what in this hobby isn't?
