OP

Quoted from dtown:

The plunger and sleeve are clean. It's just that this game had so much white corrosion over almost every metal part it would have taken a long time to get all the staining out of the metal. I'll only sit there and polish a part so long till I've had enough. It's clean and smooth. That's what matters.
According to the manual, position 4C on the score motor pulses the O relay (return relay). I recleaned and adjusted the score motor switch closer but this made no difference. I recleaned and adjusted the O relay which seemed to have helped. It hasn't re-ocurred since then. Nonetheless, I think the mushrooming on the kicker arm is my real issue. I'm placing an order with PBR for some stuff and I'll inquire as to a price for one. If it's too much, I'll just wait for Allentown.
Oh, and I don't mind the decagon score units anymore. I even bought a couple clean used one's at the last Pinfest and stripped them for parts. Good stuff.
It seems that each of these manufacturers had their own pluses and minuses. Williams's ball return mechs are awesome because they slam the ball over to the shooter lane where Gottlieb's kinda just lolly gag over a hump. However, you have to remove the apron to service a Williams one where a Gottlieb you don't. "Six of one and half a dozen of the other".