Hi, recently finished Bally playboy restoration. The ball serve coil fires, and does not seem weak, but struggles to serve the ball over the little metal hill into the shooter lane. Succeeds maybe 1/3 of the time. The mechanism has been disassembled, cleaned, new coil sleeve, and resoldered. The arm pushing the ball just seems like a bad design.
Anyone ever had an issue like this with an early Bally? How did you solve it?