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What happened is it seized. I took it apart by pushing the rotor out. It has a lot of magnetic force holding it in. Then I put it back in and it is no longer seized. I think what happened is: the bearing or bearings failed. I think one or more balls got stuck to the magnets and gummed it up. The balls were tiny. There were still a couple left but the bearings are gone. Except for the bearings everything else looks OK.
I have no speed control so it's going to be scary testing this thing. It's either 50,000 rpm or off. Should be fun.
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