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@pipwish
OK, finally got around to dis-assembling my headset.
Cartridge bearing in the bottom looks fine, maybe a bit wobbly.
The cartridge bearing in the top came apart in my hands. It seems to have failed. I have all the balls and the cage separated in my hands. Is this unusual?
So I need a replacement cartridge set for a Shimano Pro RM-01. They are stamped Tange Seki. Any ideas where to find such a thing for sale?