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Advantages of Using Lock Stitch Machines

3. Insert the Twin Needle Position your twin needle in the needle clamp, ensuring that both needle shanks are seated correctly. Tighten the clamp screw securely to hold the needles in place.

Heavy duty sewing machines have more powerful feed systems with stronger feed dogs to grip and advance heavy fabrics evenly and precisely. The presser foot pressure is often adjustable to ensure proper feeding without slippage. Some heavy duty machines also have walking feet for perfectly even fabric feeding in difficult materials.