It happened to me recently, most of my bead holes were chipped after cleaning. I couldn't figure it out until I realized how thin my mandrels had become on each end (yes, I am cheap, when one end is used, I flip the mandrel and start using the other end). Some of them were 6 years old and you could see the difference in thickness at bare eyesight. I threw them away, ordered new ones and haven't had the problem since.
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