Many years ago I was in Joann's and there was a bobbin winder - plug in or battery. It was eligible for my 50% off coupon so thought I had nothing to lose really. I always seem to need to rewind a bobbin in the middle of a project. It still works great but does not wind my Viking bobbins. But I didn't have the Viking when I got it, in fact all I hade was a Singer and and a little Europro.
Hope you like your winder. I like mine.