Pfaff hobbylock 756 Owner's Manual - Page 39
differential
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(2) Stretch overedge (Use regular or rolled hemming throat plate) * Stretch overedge is ideal for sewing decorative collars, sleeves, skirt hems, etc. on loosely knit and woven fabrics. To set the differential feed adjusting lever * Open looper cover and loosen differential feed adjusting lever thumb screw. * Slide adjusting lever upward above the center mark, as required, to stretch, and tighten the thumb screw. * To sew a seam, apply gentle tension to the fabric by holding the seam lightly in front and back of the presser foot. Note: If amount of "stretch" is not correctly set in relation to the fabric being sewn, the fabric is apt to shift away from the needle resulting in improperly sewn overedge seam. In such case, reset differential feed adjusting lever closer to the center mark. * Be sure to reset the differential feed adjusting lever to center mark for normal overedge stitching. Stretch Loosen 37