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Jim

wrote:

Also, with worn carb throttle shaft bushings, you can adjust until the
cows come home - and you WILL because any change in the relative
position of the shaft in the hole changes the position and size of the
leak. Leaking on the choke side has a lot less effect than on the
engine side of the throttle at idle.

Yes this is true. And it is also true that the forces on the throttle
plate (vacuum and spring load) guarantee that the leaking will always be
on the choke side.

The OP never said what was leaking. If it is gasoline that is leaking
around the throttle shaft a bushing isn't going to fix that.

-jim

You can make it idle perfectly, and run pretty darn good - and then
the idle will go all wonky - and it might idle perfectly the next time
without any change in adjustment.

If the shaft/bushings are badly worn, the only RIGHT thing to do is
fix or repair.