my front surly hub was being weird and making a rattling that was definitely inspiring such activities as my avatar would suggest. the hub would seem too loose, then we would tighten it up and it would be too tight. we couldn't find that happy medium. i found that a tiny bit of the threading on one of the lock/jam nuts was broken off, so it wasn't seating totally flush. surly sent me new lock nuts and t collars. the new lock nut fixed it right up.