You might want to look locally for a sewing machine repair/or sew/vac place. They often service the older Singer machines and could have parts on hand or order them for you. My local guy is awesome! If he doesn't have what I want, it's only a couple of days wait to get what I need.
Check out the wiring, on the older machines, they are often in need of replacement. I think I paid about $30 for a new power cord/foot pedal. I kept my original, as everything else is original, but for day to day use, I use the new cord because the old one seemed like it was getting too brittle.
Enjoy!