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A knurl will work fine. So will Loctite's #620 Bearing & Bushing & Lock. I've used this stuff in similar applications such as the outer race of a trailer wheel bearing that had to go into a wallowed out wheel hub. Green Loctite expands to fill a clearance of up to 0.015 in. between the OD and bore, then locks. Your application is perfect for this product.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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