Page 21 - FAQ & A

TORSION SPRING MEASUREMENT
Exact size is imperative.
You absolutely must know and understand the key measurement of your old springs to order replacements. It assumes that the old springs were the correct, to begin with; it is not uncommon to have incorrectly sized springs on a door due to a previous sloppy installation, or a significant change in weight of the door.
You must use springs that matched to the weight of the garage door. You
cannot compensate for the wrong size spring by adjusting the number of winding turns. If you do not know a proper size of the spring, then you must, in turn, have an accurate weight of your garage door.
Step 1: Determine Wind Direction
Look at the end of the spring to determine the wind direction. If the end of the spring points in the clockwise direction, it is a left wound spring. If the end of the spring points in the counter-clockwise direction, it is a right wound spring.
Note: This “right” and “left” has nothing necessarily to do with whether the spring mounted on the left or right of the center bearing plate.
With the standard door, if you stand inside the garage, facing out, then the spring to the left with the red cone is a right-hand wound spring, and the spring to the right with the black cone is a left-hand-wound spring.