also check out https://www.bronzebushings.com/
While not a proper repair, I have used waxed dental floss or tape to keep the shaft from wobbling so much it wouldn't idle. A few snug turns of floss or tape on the shaft at the body, tie it off and clip the excess. do both sides. The engine vacuum will keep it pulled in tight, and the wax will keep it from binding. The tape seems to work best. Not recommended on spring return throttles!
It is really easy to put a oiled bronze bushing in. Take the throttle plate off pull the throttle shaft out. Bore the area to 3/8 press and pin the bushing in and put it back together. Easy as pie and it is a good repair