How to Adjust the Tension on a Sewing Machine
BEST explanation I've read yet on adjusting the tension on your sewing machine! Simple and easy to remember. Tighten the tension and "pull the knots up" if the knots appear on the bottom side of the sewn seam. Loosen the tension and "drop the knots down" if the knots are on the top surface. Higher number = tighter, lower number = looser.