A tool that installs a metal tie is disclosed. The tool includes a tension mechanism and a tension control system. The tension mechanism tensions the metal tie wrapped around a bundle. The tension control system measures the applied tie tension. The tension control system includes a load cell and a worm cushion that dampens the tension applied to the load cell. The tension mechanism includes a gear train with a worm gear and a worm that distribute the applied tension to the load cell. Once the desired tension has been achieved, the tension mechanism is de-energized and a ball set and cut-off mechanism is activated to set the ball in the metal tie head and to shear a portion of the tensioned metal tie.
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