The front fan shaft bearing on my Model G has moved forward. Somehow the shaft still holds in place when running though - so far. So, where can I get replacement bearings and how does one go about replacing them? I know, the tech manual is ordered but not there yet, so would appreciate a little help in the meantime. The current bearings are barely thicker than the bracket that holds them and it would maybe appear that the bearings are held in place with a glued-on ring. Can that be? They look like white plastic. Someplace I read that these are normally ball bearings held in place with snap rings, but these sure don't look like that!