SINGER 101-12 - Manual (Page 28)

The tension on the needle thread should only be
regulated when the presser foot is down. Having
lowered the presser foot, turn the small thumb nut
(A, Fig. 15, page 17) at the front of the tension discs
over to the right to increase the tension. To decrease
the tension, turn the thumb nut over to the left.
The tension on the bobbin thread is regulated by
the larger screw (A, Fig. IS, page 20) which is nearest
the back in the bobbin case tension spring. To
increase the tension, turn the screw over toward
you. To decrease the tension, turn the screw over
from you.
When the tension on the bobbin thread has been
once properly adjusted it is seldom necessary to
change it, as a correct stitch can usually be obtained
by varying the tension on the needle thread.
To Turn a Corner
Stop the machine with the needle at its lowest
point. Raise the presser foot and turn the work as
desired, using the needle as a pivot.
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To Regulate the Tensions
To Regulate the Length of Stitch
The length of the stitch is regulated by the feed
regulating disc (D, Fig. 17, page 19) located on the
bed of the machine, at the right. This disc is marked
with arbitrary numbers, ranging from 6 to 30, which
indicate the various lengths of stitches that the
machine will make. No. 6 being the longest stitch
and No. 30 the shortest stitch (The numerals do
not denote the number of stitches to the inch). The
length of stitch that the machine is ready to make
is indicated by the number nearest the arrow
marked on the cloth plate of the machine.