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I would not worry about it unless you can grab the rotor and it has side to side play. There is nothing in there anymore except the pick-up/wheel assembly and the rotor and cap itself. If you do need a new one, have you checked how much a rebuilt one is?
Yep, I checked on the rebuilt ones, prices aren't too bad. I just wondered about doing it myself. It needs bushings or bearings, it doesn't turn smoothly or easily. Probably just go with a rebuilt...
I have taken apart some that were hard to turn. I found varnish built up on the shaft. I once looked for new bushing(s) and had no luck. I could turn some new ones if I needed to. I haven't decided on the best material yet. One bushing I pulled out was not bronze. I have some doubts as to how well the bushing gets lubed. Some older distributors had a oil cup for the bushing.
OK, I got the innards distributor cleaned so it spins freely. The upper shaft has a spiral groove in it, for a lubricant, I assume. Suggestion as to what lubricant to use?
Good question. I have sort of come to the conclusion that they are relying on oil mist in the engine for lubrication. Or perhaps the later bushings were the type that had the lube in them, the porous type. I don't have a good answer.