Necchi BU Bobbin Winder HELP!
 

I knew my Nova's bobbin winder was wonky (yes, it is a technical term). Took off the handwheel and discovered the main long screw holding the spindle was loose. Yep, it was loose because a piece is missing and the main black cast metal part has a chip missing.

Are there any folks out there that can tell me what goes on the opposite end of the spindle piece? There is a set screw and a place for a shaft. I'd take a pic but the camera is hiding.