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How Man Made Things on Instagram: "Before electric motors, sewing machines were driven by a hand crank or a foot-powered treadle, turning simple human movement into precise stitching. Each turn pushed the needle down through the fabric carrying the top thread, while a shuttle underneath looped it around a second thread to form a strong lockstitch. As the needle lifted back up, small metal teeth called feed dogs moved the fabric forward to position it for the next stitch. This clever mechanical s