If the gear itself is not damaged, any competent machinist should be able to fabricate and install a bushing in it. He would need the gear, and the shaft it rides on to fit the bushing to the proper clearance. I've done things like that on numerous occasions when a suitable part was not readily available.
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!