Brother NX-800 - Manual (Page 161)

Troubleshooting 159
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4
c
Slide the bobbin winder shaft to the left, and
then remove the bobbin from the shaft.
d
Hold the thread end with your left hand, and
wind off the thread clockwise near the bobbin
with your right hand as shown below.
e
Wind the bobbin again.
Note
z Make sure that the thread passes under the
pretension disk of the bobbin-winding
thread guide correctly (page 24).