They were part of the CPR plastics, I believe.

http://www.classicplayfields.com/photo44.html

My Fathom acts buggy sometimes. Does anyone else ever have the game kick the balls out of the traps while the drop targets are still up? It happens once in a while and requires removing the glass or power cycling the machine.

My Fathom's got a lot of corrosion all over the MPU board, but has always worked 100% until now. Could such a minor, specific weird problem be a result of this corrosion? How about a bad ROM?

Anyone have similar problems? Any ideas?

Coil test works fine, and the game works fine 99% of the time. I don't think the switches are the problem because Fathom is particular about knowing where the balls are in order to start a game (I've got end-of-game kickout disabled). Coils also seem to always work fine, really....

Damn corrosion...

When you hit 1-2-3 in sequence, it BRIEFLY lights extra ball at that yellow target. The light flashes while it's lit. If you hit it "AIR TANKS REFILLED!"

I ordered a replacement big microswitch for the trough from Marco or somewhere. The switch matched, but the wire was straight. I tediously tried to get it right, but ultimately failed, so my game still has the imperfect old one.

Actually, I think the actuator arm that's installed now is made from a safety pin. BUT IT WORKS.

Spinner.

I got all new linear flipper parts and rebuilt the flippers before I discovered that many people preferred replacing it with a different design. Nonetheless, I didn't dislike the linear flippers. They were strong enough to make all the shots, and I thought they had a nice feel. The rebuild kit was expensive though!