ArchaicArcane, Miriam,
I remember that thread, even looked for it. But I didn't find it. I'll bookmark it this time. Thanks.
From the bottom, the motors on the 401 and 500 look pretty much the same. But removed and compared I have no idea.
We have a 201-2, a 15-91 and a FW. So, if I bought a set of those brushes and they didn't fit the 500, I wouldn't be out any.
However ......
Mizkakis idea of the motor oil down on top of the bearing seems to be working. I was sewing with it a bit ago after putting several drops of Penzzoil 30 WT motor oil on the bearing and it is quieting down. Got a couple projects to do with it later and then I'm going to do a felt stitch pattern sheet. That should give it a work out.
Joe