To regulate the bobbin thread tension – SINGER 15-90 User Manual
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When the tension has been correctly set for aver
age sewing, note the number at the indicator line Q,
so that the tension may be reset should it be altered
for special work or change in size of thread.
To increase the tension, turn the thumb screw A
gradually to the right (clockwise) until the required
tension is obtained. Each higher number denotes
increased tension.
To decrease the tension, turn the thumb screw
A gradually to the left (counter-clockwise) until the
required tension is obtained. Each lower number
denotes less tension.
TO REGULATE THE
BOBBIN THREAD TENSION
The tension on the bobbin thread is regulated by
the screw R, Fig. 11 in the tension spring on the
outside of the bobbin case. To increase the tension,
turn the screw R over to the right. To decrease
the tension, turn this screw over to the left.
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.