Its a common issue for glass and lampworkers. Between the bead release, ground glass, and water/rust it sort of gets cemented in.
I'm not really sure the best way to get it free besides a little heat to get the metal to expand, or using a small bit of wire to loosen up the crud. An ultra sonic cleaner may work if you know someone with one, common in dentistry, jewelry shops, and some electronic service shops.
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