I have used a wrong bobbin in a machine, not mine at home, but one at church where we have a couple donated sewing machines. These bobbins were in the machine cabinet drawer. I filled the bobbin and inserted it and the machine wouldn't sew! Then, I couldn't get the bobbin out of the case! I really had to struggle :? . The bobbins "looked" the same, but apparently were not! I am much more careful about bobbins after that experience.
I have a Sidewinder! And love it, and fill about 20 bobbins at a time so I can keep on sewing when I am piecing. Haven't ventured into machine quilting yet!
Getting more bobbins was definitely the way to go! :lol: