It would seem to me that some air entering through the minor gap at the throttle shaft would have been accounted for when the carburetor was designed.
As the shaft wears somewhat (minor wear), would adjusting the mixture screw address the minor increase of air leaking past the shaft? I am talking about minor wear, not wallered out.
(Jon, you are from Missouri. You know dag gum well "wallered" is a real word.
)
Carl
