If the bobbin case is not properly placed back into the machine, it will fall out of the shuttle immediately after starting to sew.
- Make sure bobbin thread unrolls in the correct direction when installing the bobbin into bobbin case. [fig. B-1]
- Check that you encounter some resistance when pulling the thread. [fig. B-3]
- Make sue the bobbin case finger fits into the notch at the top of the race. [fig. C]