When you see loose stitches underneath your sewing, it usually means that the top tension needs tightening. Write down where your tension disk is before you turn to a higher value, then sew. Keep doing the above until you reach the correct top tension. The reverse of this would be loose stitches on top which means the bobbin needs to have the tension screw increased, little at a time, about 1/8 ". Sew and repeat until the stitches are equal.
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