This video start at 9.30 minutes in - for the same bobbin case same as mine 770QE
Yikes I cleaned my machine following all the instructions and literally dug out a whole lump of fluff stuck well inside the bobbin track when you take the whole bobbin case out. I've never cleaned that part of a machine before other than wiping it out, but dug around with my tweezers and pulled out quite a little pile!
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