When I bought my place a few years back, the double-size garage door (metal) had a big dent in it - this was fixed by placing metal bars across the dent. But, in the cold weather the darn thing keeps getting stuck as it goes up. I suspect this is due to uneven settling of the garage? The door seems to be a bit off-kilter, and rolls up unevenly towards the bottom of the track. WD-40 on the tracks and chains and rollers helps, but in cold weather, the door goes up only a few inches at a time - by pressing the button to make it go "up" then "down" several times, I can get it up the track all the way. I can't afford a new door just yet. Can I fix this problem? Or just have to live with it until I can get a new one?