Hi Joe - That's the case with some of the older parts. I have a Singer 66-1 from 1909, and I needed a new spring for the bobbin winder. Turns out my machine's was a very early design winder, with a much smaller spring. The very nice and helpful lady at Sew-Classic.com helped me look far and wide, but that spring is no where to be found. I had to buy a later bobbin winder from another 66-1 and replace that section of my winder so I could use it. So...as much as we would love to keep them all "original", sometimes for the sake of using them, we have to adapt. Que sera sera.