Now check the springs. There will be just one on a single-car garage, two on a two-car garage. Roll-up doors are operated by torsion springs, controlled by cables on pulleys. Two-car models can be adjusted by pulling the cable further through the plate above the door, then knotting the end to hold the newly established tension. One-car roll-up door springs should only be adjusted by a professional, as there is such a great amount of tension on the one spring that you could be injured when trying to adjust it yourself. Swing-up door springs are hooked on each side of the door into special notches or holes. To adjust the tension on these springs, simply move the spring hooks to the next notch.
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