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While I think the one piece retainer plate is great, the other is to use loctite 648 which is actually specifically designed to hold bearing races and other round fittings in place. It is insanely strong stuff. I had a production of water pumps manufactured where the impeller was aluminum press fit to a small steel driveshaft, so round to round surfaces, but with 648 retaining the two. These pumps were under constant high rpm stress and never saw a single failure.
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No physical quantity completely explains its own existence
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