Check the switches for the holes. I think they may more or less work in a similar way to the solid state ones that when a ball goes in, it hits multiple switches as it heads down. So, one of the switches along that path may have an issue, causing to miss scoring for that one switch.

There's a whole bunch of them on ebay right now.

It's just basically a motor and a small circuit board, and matter of making sure everything lines up correctly so the tickets don't jam. Nothing too complicated.

These would be great, especially for location games. The bulbs don't seem to last very long, and the sockets are brittle and break often.

An LED solution would be very welcome.

Interesting question. I thought everybody kind of stopped making them by the mid/late 80s, with Williams being the last manufacturer making them in the early 90s on the WPC system. I didn't really see anything newer than that.

Yes, there are a few bowlers with a ball, but I can't recall any recent shuffle alleys with a puck. I assumed he was looking for a shuffle alley with a puck.

Which one are you actually looking for? Games with a puck or a ball?

The most recent ball bowler is I've seen is Lane Master, which has a big digital screen and no physical pins--you just roll the ball down the lane into a rectangular cubby hole.

http://www.universal-space.com/games/lane-master/