Many things can go wrong over time with your garage door. Most of these problems are easy to fix. However, the problems that involve springs are much more serious. The springs give the force for lifting the heavy garage door and they are up under a great deal of tension. If you get careless, these springs can, and will hurt you. If you work carefully and use the correct tools then you will find that you can completely rebuild the spring system, without having to take a trip to the emergency room, in just a few hours. This DIY guide doesn't cover the extension spring system. But it will help you with replacing the torsion springs, these are the ones that mount above the door on a bar.
In so areas this job can save you a great deal of money, but in other cases you may find that it only saves you a little. In which case, you will want to weigh out whether it would be best to allow a professional to do the job for you.
You need to get a measurement of the springs. Measure the length as well as the diameter. Then measure the height and the width of your door. You will want to get springs that are double-life as well as the 7X19 lift cables, if you want to get more years out of the parts that you are purchasing. Otherwise, you can get the parts of your choice and save yourself a little bit of money.