SINGER 14T968DC - Manual (Page 31)

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To change thread type or color, clip thread near the
spool.
Place new thread on stand.
Tie new thread and old thread ends together with a
square knot. Clip thread tails to 2~3cm (1 inch)
length. If clipped too short, threads may come
untied.
Firmly pull both thread to test knot security.
Raise Presser foot
to release Tension discs. by lowering presser bar lifter
Pull the threads through the machine one at a time.
If threads do not pull easily, check for tangles on
thread guides or looping under thread stand.
When pulling thread through the needles, STOP
when the knot is in front of the needle.
Cut the thread, and insert it through the needle.
13. HOW TO CHANGE THREADS: TIE ON
METHOD