Bobbin tension depends on the thickness of the fabric that you're sewing on. A cotton fabric should have medium tension...but a heavy wool would need a looser tension. Best way to get the tension right is to take a few stitches, then look at the bottom side of the fabric. If the threads are loose, then tighten the tension one notch or number. Sew a few stitches, then test again. If the fabric is pulling up tight, then loosen the tension and check again. Top stitches and bottom stitches should both be the same.
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