Brother PC-420 Operation Manual page 38

GETTING READY ———————————————————————————————————————————————————
Pull out about 5 cm (2 inch) of the bobbin
5
thread under the presser foot toward the rear
of the machine.
Reattach the bobbin cover.
6
Insert the tab in the lower-left corner of the
bobbin cover, and then lightly press down on
the right side.
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