Hi Sharon,
Not sure if it's an issue, but most of the 15-91's & 201's need rewiring. Oftentimes you can bend the wire on itsself and the wire insulation will just crack or crumble. Especially look at the 4" of wire between the motor and bakelite connector, the rest can be replaced or rewired. Easy fix for someone that knows wiring basics but expensive if you need to send to shop.
I oftentimes use bad wiring (which I count on) to talk the price down and explain how dangerous the machine is (with dramatic flair).
Good Luck
Jon