Bad bearing?
 

I'm taking the electronics out of my CRT .5 to sell and have been testing them to make sure nothing is wrong. I put some oil on the bearings and spun it by hand and thought I heard a noise, so I hooked it back up to the MM and the rear bearing is making quite a bit of noise. I have other motors that make the same noise but they all run perfectly and there's no slop in the bearings.
http://i140.photobucket.com/albums/r...MR-50Noise.jpg

It sounds like it's bad, but it has very little use on it (no hard use) and there's no lateral play in it.