Just curious, as I have had little exposure to EMs, and having recently picked up this one, I am a bit curious.
I just rebuild the flippers on these, using the kit from Marco. Before I started they were a bit weak and one was VERY noisy. After the rebuild, they are 200% better and the noise is gone, the coil sleeves in particular were copper and not nylon, so I am guessing quiet old. The stops were also in rough shape.
I have noticed though, if I have the flippers up to attempt any sort of catch, if the ball is moving fast enough toward the flipper, the flipper bounces a bit still when the ball lands on it. Should this be solid, or is that expected for a machine of this era? I was reading today that I should clean the switches and relays for the flippers, and I will give that a try, I am just not sure what my exceptions of how solid the flippers should be.