Class 99 & 99K
To Regulate Needle Thread Tension
The tension on the needle thread can
be tested only when the presser foot is
down.
The numerals "0" to "9" dial X, Fig. 29
indicate the different degrees of tension
that can be obtained. The numbers do
not denote size of thread or amount of
tension.
When the tension has been correctly
set, note the number at the indicator
line Y, Fig. 29 so that this setting may
be regained should the tension be
altered for special work.
Fig. 29 To Regulate Needle Thread Tension
To increase tension, turn the thumb
nut Z, Fig. 29 gradually to the right
(clockwise) until the required tension is
obtained. Each higher number denotes
increased tension.
Page 23
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