Once the chain is secure, separate it from both sides of the trolley. Disconnect the rail from the header bracket and move the rail off to one side. Slide off the old trolley, and slide on the new one. Reattach the chain and adjust the chain tension. Replacing the trolley on a belt drive and replacing it on a screw drive are similar procedures. A new trolley will cost $25 to $40 depending on your model.
Widths - in addition to doors coming in a range of styles, they can be found as double-width and single-width styles. There are some serious considerations when opting for one over the other. For example, if a homeowner decides to use a single door that covers the entire opening of a two-car garage they will have to make serious structural modifications to the entry way;
Because garage doors are large, heavy, and mildly complicated, most people who buy them take advantage of these services. But, if you’re pretty adept at DIY tasks, you can save some money and enjoy the satisfaction of doing the job of installing a sectional garage door yourself. (Sectional garage doors travel up and down on rollers that ride along tracks at each side of the garage doorway.)
Step 1: Check the metal tracks inside the garage. Look at the mounting brackets that hold the tracks to the walls. If they're loose, tighten the bolts or screws at the brackets. Working inside the garage with the garage door closed, examine the tracks for dents, crimps, or flat spots. If there are any damaged spots, pound them out with a rubber mallet, or with a hammer and a block of scrap wood. If the tracks are badly damaged, they should be replaced.

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