Hello
magic1,
A warm welcome to the ODK Forum, we all love to tinker and learn here.
I also have 2 Supercuts, one is a one owner unit and the other is identical but in a much poorer state which is also my spare parts unit as no parts are available at all.
BTW I'm not trying to be petty here but there was no 17 inch SC made, rather it will probably be the 18 inch machine which was probably the most popular size in petrol (domestically) and the 20 inch in electric.
Anyway you'll find lots of valuable information here at the ODK.

Cheers,
BB