Kenmore 1347 Instructions Manual page 12

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Bobbin tension requires adjusting tess frequently than the upper thread
tension
If the stitch is satisfactory but the seam is puckered, it may be necessary to
loosen the tension on both the top and bottom threads Be sure to balance
them as indicated on Page 9
When adjusting the tension on the bobbin case, make slight adjustments with
a screwdriver
Turn Counter Clockwise,
Turn Clockwise,