If it's just a scratch, with no high spots to gouge the bearing, no problem. I'd shoeshine it with fine-grit emery cloth, measure it with a micrometer to make sure the shaft is round, and give everything a good cleanup. The scratch will just pool oil under the bearing.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!