Singer CLASS 99 - To Regulate Bobbin Thread Tension

Class 99 & 99K
To Regulate Bobbin Thread Tension
The tension on the bobbin thread is
regulated by the screw A, Fig. 30 which
is nearest the center of the tension
spring on the outside of the bobbin
case. To increase the tension, turn
screw A over to the right. To decrease
the tension, turn this screw to the left.
When the tension on the bobbin thread
has been once properly adjusted, it is
seldom necessary to change it. A
correct stitch can usually be obtained
by varying the tension on the needle
thread.
Fig. 30 Bobbin Thread Tension
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