"--armature problem--"
That started with vibration from the longer,more powerful Super J motor.This was fixed with 4 bars cast in motor housing over the commutator that you would see in later Olympia & Silverado motors.
Possible and easily fixed problems on 1205 could include plastic carry handle breaking,bad connection between cordwinder and motor terminals and metal sleeve for carbon brushes sliding toward commutator(later fixed with a bump that fit notch in plastic holder to prevent movement).