Kenmore 50 Instructions Manual page 39

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ADJUSTING TENSIONS
A perfect stitch will have threads locked between the
two layers of fabric with no loops on top or bottom.
(Refer to page 24)
Fig. 1
PROBLEM REMEDY
Fig. 2
Upper thread too tight
:.[: :-
Upper thread too loose
o ......
Fig. 3
12
Decrease Tension
Increase Tension