OK, so there is supposed to be a ball bearing in the bottom plate? What is the part number for the bearing? I have some but they are too large for the hole.
The bottom plastic plate is tight, no movement, but the top metal plate is loose on the armature end. How do these get 'restaked'? I think the looseness of the top plate is also causing an issue with the motor.
Also where does the bare wire coming off the windings get soldered? One end goes under the one brush cap screw(solder lug), where does the other go?