Gameplan coils are bigger than Bally, so they won't fit. You'd need to put in a whole new baseplate etc etc. I just had a bunch lying around. Not sure where to buy them now.
I would have tried to keep the gameplan parts in there if I could but the links were totally sloppy/blown out (terribly trampoline effect!) as were the stops/plungers so it just made sense to use what I had.
The full classic stern assembly would *probably* do the trick, but i haven't actually tried it.
Nope - stern/ballys are basically the same size. I think ballys were slightly shorter which is why they used a spring washer and stern didn't.
Stern/Bally coils should work fine in the game though if you wire them correctly (at least my bally coils did).
J-25-500/34-4500 is the same strength as the standard bally flipper coil of the era. Not sure what would be the closest strength to the gameplan flippers (they felt comparable to met though.)
Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside