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Here is a basic physics lesson on garage doors. They are made up of all the classic mechanical tools, Pulley, wedge, fulcrum, and levers. When a door with standard lift operates, we use a rather flat drum to wind up the cables because the weight of the door disappears evenly as the sections...

The LM3800 list price for most dealers is $289 with one remote. Most people want extra remotes and Keypad. Add in Tax and shipping you get more. In a high lift conversion, the existing springs would need to be replaced along with the drums. Professional Installation is benificial for these...