Originally Posted by cmac2012

For anyone not comfortable with doing it, I agree. I've done it many times, it's not that tough, you just need to focus really well and have the right wrench at the ready. You can get a 36 steel rod, 1/2 inch dia at home depot, cut it in half and you have your tensioning tools. You turn the hub 90 degrees and then put the other rod in the next hole. The tightening nuts are square, a good Crescent wrench will do. Specialty wrenches are available.

The harder part is turning it the correct number of times. If there are two springs, I'd unwind the other one and count the quarter turns. You want both springs to have the same tension of course. One way to get the correct tension is to tighten each spring to say 10 or 15 turns each and see if the door will stay stationary at about 4 feet open. Or do that with one spring if it's a single. Tighten gradually until it will. IIRC about 25 quarter turns is about what they usually take.

If you do it yourself, make sure the plane that the tightening rods turns in is never aimed at your person.