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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.
1 Re-thread the sewing machine making sure the thread is passing through every thread guide on its way to the sewing machine needle. 2  Your sewing machine manual is the best guide to how to thread your particular sewing machine. 3  If you're still having, loopy bobbin thread, change the sewing machine needle. Re-thread the sewing machine making sure the thread is passing through every thread guide on its way to the sewing machine needle. 2  Your sewing machine manual is the best guide to how to thread your particular sewing machine. 3  If you're still having, loopy bobbin thread, change the sewing machine needle.