I purchased one for my machines, true Jamone needs the fuller bobbins.. but the brother will give you a fit.... I took me all of 3 weeks to figure this out. (slamming my head into the wall didnt work either, wondering if I done something 2 the machine?)
I had purchased a new brother machine at big chain store, tried to use my bobbin winder on the bobbins--no way,(they were way over full for the machine). Brother uses a less is more approach I think? Just letting you know....
barbara