Def. thinking wheel bearing from the description. I've seen many that don't even fail the "wobble" test, as mentioned, but make that described noise.
I'll be at the meet tonight, and as resident professional wrench turner, I'd be glad to go for a ride and take a listen if you like dude!
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"...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..."
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