You mean the score motor? Check out Clay's pin repair basics website. Also Pinwiki. That will at least get you familar with the basic parts and how they interact. There are many things that can cause the score motor to run continueously like that. Score reels not zeroing out is one of the most common. Good luck and welcome the world of EMs!

Yup, (looks like )the score motor......(but it isn't?) boy is this game complex!

Nice,
I'm guessing it has an option for starting with up to 7 balls to play? (I know that was true for some titles in the 60's). Look forward to further updates.

I made a bulb tool out of an old shooter tip and a piece of wood. Rounded the end of a dowel and then screwed thru the insde of the rubber tip. Works real good!