Singer 201P - Thread Tension Control; Needle Thread Tension

THREAD TENSION
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For perfect stitching, the tension on
needle and bobbin threads must be
heavy enough to pull threads to centre
of material to make a firm stitch.
TO REGULATE THE
NEEDLE THREAD TENSION
NOTE: Unless the bobbin thread ter-
sion has been altered, a wide range of
threads, from fine silk to heavy cottons,
can be formed into a perfect stitch by
regulating the needle thread tension
only.
The tension on needle thread can be
tested only when presser foot is down.
The numerals *'0’’ to “9"’ on dial Y
indicate different degrees of tension that
can be obtained. The higher the number
the greater the tension. The numbers do
not denote size of thread or ounces of
tension.