I found a picture of the bobbin I am supposed to use in this machine and matched it up to the bobbins I was using and I had the wrong one in. I found one that was right and tried that and now the machine stitches fine. In straight stitch anyway. It still does not zig zag right, but I can live with that. I am not sure machine I will use in the frame. The Kenmore has a cabinet, so I may find another one here that works as well. Throat size is my first concideration. And that it stitches well. I have several to choose from. I need to get one of my vintage machines ready and use that maybe, although they are so heavy.