Pfaff 76 Owner's Manual - Page 18

Balanced tensions are essential for sewing. Both tensions are correctly balanced if the needle and bobbin threads interlock in the center of the material. The bobbin thread tension is regulated by turning the small knurled screw on the bob bin case. Turn this screw right (with your thumb nail) for a tighter tension, or left for a looser ten sion. If the same size threads are used in the needle and on the bobbin, there is no need to adjust the bobbin thread tension. This tension is set correctly if a slight re sistance has to be overcome when pulling the thread. Numbers 0 to 10 indicate different degrees of tension on the upper tension dial. The higher the number, the tighter the tension. For ordinary sewing operations, the upper tension should be set at about 5. 16 bottom top Upper tension too tight or lower tension too loose. bottom top Upper tension too loose or lower tension too tight. bottom top Both tensions correctly balanced.