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Unlike standard lockstitching, which uses a bobbin, overlock sewing machines utilize loopers to create thread loops for the needle to pass through, in a manner similar to crocheting. Merrow's original three-thread overedge sewing machine is the forerunner of contemporary overlocking machines.
2. Double needle. To achieve a more professional-looking hem without professional equipment, turn up the hem and sew with a double needle (also called a twin needle) from the right side of the fabric. The bobbin thread will zigzag between the parallel stitches, resulting in a stretchier hem.. The nature of the zigzag stitch allows the thread to stretch with the fabric. Turn the hem up the desired amount, then use a zigzag stitch to secure it. A narrow zigzag stitch is less noticeable.