What is the condition of the shaft? If it's worn, you'll need to find a new shaft to go with the bushings. The throttle body will need to be reamed oversize, then bushings will need to be pressed in, and line-reamed to fit the shaft. If the shaft is worn, the fit won't be much better.
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!