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Thread Storage: The bobbin stores the thread for the bottom layer of a stitch.Stitch Formation: Works in tandem with the top thread (from the needle) to create the lockstitch.Bobbin Case: Holds the bobbin securely in place, ensuring smooth thread feed.Thread Storage: The bobbin stores the thread for the bottom layer of a stitch.A bobbin is an essential component in sewing machines, including hand-cranked machines, used to hold the thread that creates the underside of the stitch. Here's an overview related to bobbins in hand-operated sewing machines: