I picked up two bowlers sight-unseen for $800 each. They had been sitting in storage for 25 years, and worked when put away. I knew nothing about them other than they were electro-mechanical. One (Bally) is 14 ft. long, uses a 3 inch ball, and the other (united) is 11 ft. long, uses a puck like the one you have.
I had to take the mechanical displays apart piece-by-piece because all of the internal moving parts were frozen; grease hard as tar. All the wiring was intact, and I went thru all of the contacts individually (hundreds of them). Used special grease on the stepper board contacts, something made specifically for those contacts, and used synthetic oil and synthetic grease for all other moving parts. Both are six player times 3, 18 numerical reels on each machine!
I got them working 100% and they're the hit of the game room. Everyone seems to enjoy the machines.
Slowly building a knowledge base on E2000 series Bally machines and J400 Jennings. Started with the antique Mills and Jennings. Getting there...