Originally Posted by bbogue
YCare must be exercised on the shafts. They are another common place for vacuum leaks.
Very true. Back in the day my old daily driver had an Autolite 2100. I had so many miles on the car that the brass throttle shaft had ovaled out the linkage side of throttle body. A starving student with no money, I enlarged the outside of the bore slightly to accept an O ring. Then I threaded the end of the shaft to accept a washer and lock nut, and used that to compress and seal the O ring. I drove the car for several years and many more miles after that.