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[peruano]

It makes sense in retrospective. Look at the wear around the hole in the hub of the polishing plate. Its worn laterally and far from round in all dimensions. I might be tempted to drill a new hole on another side of the hub and tap it with a set screw.  Then again I might leave it alone if it seems tight on the shaft. 

[Slabbercabber]

Who'd a thunk.  I would have expected a dressing down if I ever designed anything with a roll pin in that kind of application.  But in small specialist machines, anything can happen.  Glad you were able to solve the problem.

[Ryaly2dogs]

I am joining this thread late but love to see the old school machinery produced back in the day.  You look to have acquired a nice little unit.  Good luck on the updating process, it is very much a learning process but most of the solutions, once you determine them, turn out to be really quite simple.  Have fun with it as well.

[cabomoon]

UPDATE: I got the  bearings off and after a couple attempts, pieced everything back together. Thanks to everyone who helped guide me along the way. This weekend I was able to figure out a gravity fed drip system to get water on the wheels, which seems to be easier to control than the pump that came with the machine, and give it a try. I will post a picture of two when I have something finished up.

[peruano]

congratulations.  Its always good to get something back together and find that it works.  Gravity feed works fine; it makes you stop once in awhile to refill the source container and in my shop for the winter, it allows me to add hot water.  If you find you are leaving a stone dust streak on your wheels, its a sign your are not using enough water; otherwise you are fine.