I was only referring to the brushes.
I haven't had a motor bushing in my hands yet.
Which brushes worked on the 401? When I googled the part number ( in the other thread) the brushes were the FW / 201-2 brushes,... Are those the ones you used? Is the motor the same in the 500? I don't think I have a chart for it, and I'm stiff today so I don't know when I'll get into the sewing room to flip some machines around.