Lee flour mill motor lubrication

If one of the balls in the  bearings is scored or galled, then oiling may make it sound better, though not for too long.  I have not watched this entire video, but I have watched some of his other videos, and he knows his stuff.  https://www.youtube.com/watch?v=S9TAttJwEFI   Another option, if you have a source of vacuum, like a  vacuum sealer with the attachment for mason jars , is to remove the bearing, submerge it in a glass jar with oil, then pull a vacuum, then release the vacuum, and it will get the oil past any seals.  This poster uses grease and a similar setup  https://www.youtube.com/watch?v=OrovQFbMcnc  ( you can skip past the first minute of the video )  If you think there is grit in the bearing race, you can try soaking it in mineral oil, then put it in a container, pull a vaccum and release the vac, then take it out and try spinning it to get the remaining mineral spirits out ,  and repeat a few times before doing the oil in a vac trick.    On my Lee, i ended up pulling the bearing and replacing it with one off a donor.