Can you post a picture of where it goes into the machine? If its a plug you should be able to just buy a new set of wires and reattach to the original foot control and the plug that goes into the machine. That's what I've done anyways. The wires going into the motor and the light looked fine on mine though.
This blog post is full of info and pictures, and there are other posts on the blog that might be helpful too. You can decide if it's sometng you even need to do based on the pictures, then decide if you want to try yourself or give it to someone else to do for you.
I also have my grandmothers 15-91 and love it. It makes it extra special.
Last edited by misskira; 07-12-2012 at 02:34 PM.