Bobbin Thread Breaks
- Bobbin has not been fully inserted in bobbin case - Securely install bobbin into bobbin case.
- Bobbin has been incorrectly threaded - Correctly thread bobbin case.
- Bobbin does not turn smoothly in bobbin case - Check to see that bobbin has been wound evenly or is bobbin bent.
- Lint in bobbin case or shuttle - One drop of oil abound the hook
