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Recently bought a set of STM adj.pulleys 2nd hand, and I've noticed that some of the teeth are marked, nothing too serious but I can feel slight unevenness when I run my thumb over them. Obviously this is the surface that mates with the belts; might this be an issue over time?

TIA
 

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If by marked you mean that some of the teeth have nicks or evidence of some damage, scoring, sharp edges, or some other such flaw then yes, this could pose a problem for your belts. Always err on the side of caution when dealing with such things. If the affected teeth can be smoothed out in some way then perhaps the pulleys are useable. I'd take them to a competent mechanic or machinist to have them looked at carefully and see what they recommend.
 
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