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Those look spooky. Is it possibly corrosion as it appears to be beneath the surface of the bearing face? If not from moisture, perhaps something acidic as more to Bob's point.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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