Pfaff 645F Owner's Manual - Page 24

--s-- Basting Machine basting is very useful for join ing seams for trial fittings, marking construction guidelines, and basting pleats and hems. Use longest stitch possible, setting stitch length at 5. Loosen tension on upper thread. Choose thread color to contrast with your fabric so it can be easily seen. Basting stitches can be removed easily by clipping upper thread, then pulling out lower thread. Staystitching Staystitching prevents stretching and acts as a guideline for clipping and joining curved edges. Staystitch any edge that might stretch during handling before the final stitching. Staystitch on a single layer of fabric; always stitching in the direction of the grain. Place stitching 3mm away from seamline in the seam allowance. 20 - -