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Upper thread tension
Basic thread tension setting: "4".
To increase the tension, turn the dial to the
next number up.
To reduce the tension, turn the dial to the
next number down.
A. Normal upper thread tension. (A1)
B. The upper thread tension is too loose,
increase setting. (C1)
C. The upper thread tension is too tight,
decrease setting. (B1)
Note:
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