Thanks, I'll try that. The quiet 503 is at the school. I won't go back until week after next because they're testing next week. We finished their quilt, so it's time to bring all that stuff home.

bkay

Remove your bobbin and place a couple drops of oil in the very middle of the bobbin case. I know there isn't a wick there and it isn't an oiling point in any diagram but I promise you, it needs a drop of oil. Let it sit for a bit then put in a bobbin and sew on some test fabric to get the oil worked in. You will hear the change in the sound of your machine when whatever is causing the noise finally gets the drink of oil it has been crying for.

I pulled on some stuck thread on my 401A and the same thing started . I had other problems with it and took it in to be fixed. I had sprung the bobbin case and had to get a new one and it has worked fine with the new case and no more problems runs so smooth and no more broken threads or hang ups.