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Loss of magnet strength is puzzling to me, unless the focus was bad BEFORE you disassembled it. I know generator armatures have to be poled if they have been dropped, but that is just restoring a weak remnant magnetism - the focus magnets should be strong and I would think shouldn't lose their magnetism suddenly. (I could be corrected by someone who knows!)
Well, at least you have it fixed, so the mystery can be contemplated at your ease.
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