Singer 1 One Instruction Manual 34 - Page 21

8. How to sew three-thread ultra-stretch mock safety stitch The 3-thread ultra-stretch is sewn with two needles, one looper and a spreader. (1) Convert right looper into spreader (see page 10) (2) Thread left looper (yellow path) (see page 11) (3) Thread right needle (green path) 1 (4) Thread left needle (blue path) 1 • • (5) Correct thread tensions for 3-thread ultra-stretch (see page 12) Right needle thread Be sure the threads are correctly threaded otherwise proper tension cannot be obtained. Left needle thread Topside Left looper thread Underside Set each tension dial to setting shown below and test sew on a sample of your fabric. Fabric Light weight Medium weight Heavy weight Blue 5.0 5.0 9.0 Tension Dial Green Orange Yellow 1.5 Spreader 1.0 1.5 Spreader 1.0 2.5 Spreader 1.0 Right needle thread tension dial (green) Left needle thread tension dial (blue) 2 3 3 4 Left looper thread tension dial (yellow) z A 3 4 Adjust thread tensions to suit your fabric making reference to table below. Make adjustments in increments of no greater than half a number at a time. 1- When looper thread is too loose. Right needle thread When left needle thread is too loose. Right needle thread When right needle thread is too loose. Right needle thread Left needle thread Topside Left looper thread Underside Turn looper thread tension dial (yellow) toward the (+) mark. Left needle thread Topside Left looper thread Underside Turn left needle thread tension dial (blue) toward the (+) mark. Left needle thread Topside Left looper th read Underside Turn right needle thread tension dial (green) toward the (+) mark. 19