Lynn is right on the money. I machined my new rollers from 4140 and had them hardness tested against the original ones and they came up the same(can't quite remember the figure, it was some 20 years ago, I think around 54-56 Rc). They have not given a bit of trouble since. Again, best to go with 2RS bearings, sealed from the factory. With the very little rotation and no speed, they too will last a life time.
Perry
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