pilot bushing??

We seem to have two threads going on this issue. Another thing you ABSOLUTELY need to do is compare the length of the gearbox shaft to the depth from the bell to the pilot hole "bottom."

Some cranks are not deep enough, and one fix used to be to chop a little off the end of the shaft. Not as hokey as it sounds. My recollection is around 1/4-3/8" is all you need.