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I'm curious how you spun bearings? Has it been burning oil? Has it ever run low on oil? Did you spin it under high g-load while winding it out? Every time I've spun one it's been under high g-load.
I kind of agree with you about contamination. I've spun a lot of bearings over the years and I've never had top end issues after rebuilding. But it does seem odd that you are suddenly having other problems. There must be a connection.
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