Butterfly Sewing Machine Head

• All-Metal Cast Iron Construction: Engineered with a rugged, full cast-iron frame body and durable steel internal gears that resist mechanical wear over decades of heavy service. • Thick Fabric Capability: Provides high mechanical piercing force, allowing it to stitch smoothly through dense materials like multiple layers of denim, heavy canvas, and upholstery fabrics. • Lever-Type Stitch Regulator: Built with a front-facing vertical slider assembly that allows the operator to quickly adjust stitch length or switch into a locked reverse-stitching mode. • Auto-Tripping Bobbin Winder: Equipped with a front-mounted, spring-loaded bobbin winding mechanism that automatically trips and stops filling when the bobbin is full. • Standard Drop-in Mounting