Pre-wound bobbins
Has anyone tried to use these in their vintage machines? I got a box of 100 for $5 and they fit my other machines that take a 15 bobbin. Will they work in my 15-91 without messing things up? I'm making a charity quilt and will be using the 15-91 to quilt it with. If they'll work it sure will save time and my working thread since there's a lot more on these.