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Looks like a protective coating to prevent oxidation before install. Spray some brake cleaner on a rag and check if it wipes off. Only a problem if it doesn't come off easily.
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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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