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.
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