CULater String eating

Ok, I understand I could fix this by rubbing it with some kind of denim, but what actually is the cause of this? is it the BB? is it the Anno?

And while we’re at it, how does the CULater grind?

After i satined mine it grinded a whole lot better, and I was having the string problem. What I did was take fine fine fine grit sand paper and lightly touched the inside of the yo until it was just anno so it looked all black

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Thanks alchemist :smiley: I just received mine and the previous owner already did it… Thread lock