Photo: Kolin Smith
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Two springs counteract the weight of the door and make it easier to lift. Before we can attach the spring, we lift the door open and tighten C-clamps to the tracks to prevent the door from closing. One end of each spring hooks on to an open eyebolt threaded to the metal hanger; the other end connects to a sheave or pulley wheel. To keep the springs from sagging below the track when the door is opened, we stretch a steel cable horizontally through the center of each spring.
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