The only way I knew what mine were made of was by haunting Audiokarma for a long time and people said they were oil-impregnated sintered bronze. The color was key... copper-colored instead of the silver-colored steel sleeves that I recall from my long gone V-M. Google research told me how they got the oil into the bronze bearings and how to relube: dissolve and remove the old oil and use heat to make them act like a sponge to suck in new oil.
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Tom
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