A thin spacer between the front bearing and the fan can be fabricated from a flat washer if necessary- - - -use a "SAE" washer, which has a smaller outside diameter than the usual hardware store item- - - -plenty of them available on Ebay.
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!