Upper (needle) thread, Before threading, make sure to raise presser, Foot and take-up lever to the highest position – Brother 681B-UG User Manual
Page 8: Then place spool of thread on the spool, Now bring thread down and up through, Bring down and pass through the thread guides, Note: if the threading order is not correct, Thread breakage, stitch skipping, Wrinkling of fabric will occur
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