Originally Posted by Qulting123

Hi.

I`ve recently acquired a Singer 401 vintage sewing machine in good condition. I have cleaned it, and everything seems to be working as it should. However there is an issue with the upper thread getting caught and stuck UNDER the bobbin case itself. The case is an original 172082. I have attached a couple of photos. The first image shows what is supposed to happen, and the second and third images shows what is currently happening.

Is this simply a matter of a worn case? The case seems to sit a little to "high" in the machine which is why the thread gets caught.