Hoping there's some Bally fans here who can help. I picked up my first Bally (all my other pins are GTBs) which is a '71 Expressway. BG is in really nice shape, playfield has a few wear spots but overall it's in pretty good shape. In researching this title it seems the pop bumpers are weak (an easy fix) and so are the flippers. I was advised to update the flipper mechs to the Bally '74-80 type. Problem is that I don't know what the original factory flipper coil is since I have two different ones in mine. There's an AF 26-750/31-900 and an AF 26-650/28-800. The latter one is the stronger of the two but I have no idea which if any was original. Thanks for any help.

Thanks for taking the time to look that info up, DF. That's a great link and I'll be referring to that quite a bit as I get this pin working again.