Inspection of motor parts

Clean all parts before inspection.
End plates: Make sure that they are not scored or scratched. If the scratches are shallow, polish with fine grinding paste against a face plate. Clean thoroughly.
Rotor: Make sure that the end faces do not have any marks or burrs. Make sure that the hexagon drive is not damaged.
Cylinder: Make sure that the bore is not scored or scratched. If the scratches are shallow, polish with a fine grinding cloth. Clean thoroughly.