Brother Simplicity SB3129 Operation Manual page 38

GETTING READY ———————————————————————————————————————————————————
Pull out about 5 cm (2 inches) of the bobbin
5
thread under the presser foot toward the rear
of the machine.
6 Reattach the bobbin cover.
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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