Mickey2

Very unfortunate with the facy Juki. That's one advantage with most vintage machines, get the hand wheel and clutch screw to turn smootly and it should not be much of a problem. Separate winders can be fast though, and less strain on the machine.

Cari-in-Oly

I don't buy pre wounds. For my embroidery machines they're about $25 a box. I buy a large cone of bobbin thread for $8 and can wind a lot of bobbins. I wind 10-20 at a time, it doesn't take that long because the winder on my machines are fast. I do have a separate winder for my long arm but it's for a size M bobbin so none of my other bobbins will fit it.

Cari