I have an old crawford garage door opener (chain) w/ multi code digital receiver. The opener just makes a clicking sound when trying to open door with remote and button.

My garage door is 4.5 years old and closes all the way however this month I noticed when it closes, one side is about 2 inches higher than the other giving the appearance of a a crooked door or sinking driveway :( The springs are center mounted and appear to be working fine. The door opens and closes with no problem and is still balanced when doing the half-way door test. I looked at the cable take-up wheels over the roller tracks and one is unwound about 2 inches more than the other when the door is closed. I see 2 nuts on these wheels that looks like the whell itself can be adjusted to let out some cable slack making the door align properly. Is this correct and can this be done without injury since I'm not actually touching the spring mechanisms :confused: Thanks, John