A torsion spring system consists of one or two tightly wound springs on a shaft with cable drums at both ends. Mounted on the header wall above the garage door. The springs consist of the steel wire with a stationary cone at one end and a winding cone at the other end. Cables run from brackets at the bottom of the door to the cable drums. When the door is raised, the springs unwind and the stored tension lifts the door by turning the shaft  and cable drums, wrapping the cables around the grooves on the cable drums. When the door is lowered, the cables unwrap from the drums and the springs are rewound to full tension.