Things that you can do to make the bearing go on to the shaft.
- Put a dab of grease on the shaft and "wiggle" the bearing down onto the shaft.
- Use emory cloth or scotch brite pad to smooth the surface of the shaft.
***
Do not try to lathe down the shafts*** The dimensions of the "trouble" shafts that I have seen do not require more then 5 minutes of scotch brite/ emory cloth work.