Kenmore 15 Instructions Manual page 15

When stitching is unsatisfactory as in
figures 2 and 3, adjust the upper thread
tension. Lower thread tension requires
adjustment less frequently than the
upper thread tension.
When stitch is satisfactory, as in figure 1
and seam is badly puckered, the cause
may be tight tensions and both upper
and lower may be adjusted. (See page 32)
When adjusting the tension on the
bobbin case, make slight adjustments
with a screwdriver. (See page 32)
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