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25 Shell Roll Hem For shell roll hems, use the roll hemmer (2 red lines). The material with knitted fabric is inserted in the spiral guide tongue a a for roll hemming. The zigzag stitch bridges the entire seam. Tight top thread tension and large stitch length produce the shell-type effect. This shell roll liein is used mainly for edging knitted (roods. 48 Braiding Insert a soft cord in the guide hole of the zigzag embroidering foot, which is marked by one red line on its shank, and stitch o