I wondered about that.

I saw your post at https://www.quiltingboard.com/vintag...k-t284512.html where you said your bobbin winder was different. I found this thread and thought I would respond here.

Were you able to find a shuttle and bobbin that fit your machine?

It seems I have seen a winder that had the tension discs at the top of the arm, but can't remember what machine. I agree with Macybaby that the bobbin winder is not original for your machine.

I believe that there may be some parts missing from your bobbin winder. It may have worked at one time, but hard to tell. I believe that there should be something on the left side of your winder. It kind of looks like there is a spring on the left, but it should have a pin on the left side and some sort of cap to hold the bobbin in for winding. Without the shuttle being able to stay in between the "arms" there wouldn't be any way to wind the bobbin - other than by hand.

I found some pictures of German bobbin winders that aren't the same as yours but they all show a pin and another piece on the"inside to hold the bobbin. I'm not affiliated with links.

http://lizzielenard-vintagesewing.bl...ders-no-1.html
http://lizzielenard-vintagesewing.bl...ders-no-2.html
http://needlebar.org/cm/displayimage..._display_media
http://needlebar.org/cm/displayimage..._display_media
http://needlebar.org/cm/displayimage..._display_media

Unfortunately, there is not a "Universal" long shuttle bobbin winder, like for round bobbins (for example-Sidewinder). Probably a lot of us have thought about figuring out a way to do it. There were many different sizes of long bobbins.

Janey - Neat people never make the exciting discoveries I do.