SINGER CLASS 99 User Manual download pdf (Page 24)

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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SINGER CLASS 99 User Manual Page 24