I looked at a garage door yesterday that was definitely one of the cheapest made ones that I have ever seen. It is a 7 x 16 sectional, with 5 substantial vertical ribs in each section, but the only horizontal reinforcement is a crease in the ultra light weight aluminum skin, along the top and bottom of each section. Anyway, they have an opener on it, and when the door is raised or lowered, the center of the door deflects in at least 6". I checked the door with the opener disconnected from it, and it could not operate any better. The springs are balanced good, the rollers and hinges are in good shape, the track is in perfect alignment, etc., but, in my humble opinion, it is simply a cheap door. My first suggestion was that they replace it, but, with two kids, they have enough things to spend money on, so I suggested that they operate it manually for the time being, and that we might try adding some horizontal stability to the top secion, in order to keep the door from deflecting, and ultimately rendering it inoperable, when the opener is used. My thought is to span the vertical ribs with something like 1-1/2 x 1-1/2 slotted angle, horizontal, bolted into each rib, near the top of the door. Has anyone encountered something like this, and/or does anyone have any other thoughts or suggestions? Thank you.