There were a couple pins at the Black Forrest restaurant across from Bronners, the x-mas superstore. Stop in that place too, if you want to be bewildered by the amount of holiday crap they sell year round. There was a Roller Coaster Tycoon and F-14 last time I was there.
There's a Monopoly in the bowling alley in Clio one exit to the south and it plays pretty well. The Ac/Dc at Bavarian Inn was messed up last time I was there. Always putting two or three balls in the shooter lane after a couple games.
The Flint Alley Pass Pinball League plays at Richfield Bowl the third Tuesday of every month. There are about a dozen perfectly maintained pins there, including newer Sterns like TWD and GoT, and older stuff like Centigrade 47 and Grand Lizard. This place would be about 30ish minutes from F-muth. Next night is March 15th.
Years ago, there was a really cool arcade right downtown F-muth, but sadly it got swept up after the turn of the century. There's a few hidden gems around Flint and most of them are on the PinMap, I think.