It seems hit or miss with the Stern games I have on location. This faulty coil stop problem was worse several years ago, seemed to get better and now it is an issue again. In some cases, one coil stop on the same game is fine, while the other one is defective. I don't recall this issue on any game before Star Trek for me, so there must be bad batches of parts that might affect one game on the production line but not another one built in the same run. It is an easy problem to see, just look for the metal shavings or sticking flipper and replace the coil stop.

With Stern flipper parts, just keep a bunch of spares on hand. Everything in the assembly will break at some point--EOS actuators, EOS switches, coil stops, return springs, coil stop fasteners, flipper bats and buttons, though I haven't seen a baseplate or nylon bushing break in a long time.

Haven't seen that problem too much on my ACDC LE, it has around 9,000 plays and other than normal maintenance and a broken bell clapper rod, no metal issues of note. Lets hope it stays that way!

This coil stop problem is not a new issue. I remember running into it on Mustang several years ago and for some reason it keeps popping up again and again.