I've also used a pipe tap and a grease fitting adapted to thread into the bushing. Then a hand pumped grease gun does the job without any hammering. My tap and die assortment goes up to 1 1/8" NF diameter, which is a pretty popular barrel thread on custom rifles.
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!