Zenith Carb Throttle Shaft Bushing

["Witbracht, Ivan L" <Ivan.Witbracht@West.Boeing.com>]

I have a Series 2 with twin Zenith carbs that I rebuilt about ten years ago.
However now, I have an air leak at the point where the throttle shaft enters
each of the carb bodies.  1) Since I can't remember, is there a bushing
there that can be replaced?  2) If not, would this be the type of job a
normal machine shop could handle? 3) Any other suggestions?


Thanks.