You can buy garage door cables from several retail and professional sources, but you must get the correct length, diameter, and type for your specific door height and spring system. Home improvement stores like Home Depot and Lowes carry universal garage door cables in their garage door parts aisle, typically for 7 foot and 8 foot doors, with extension spring cables and torsion spring cables costing 15 to 40 dollars per pair. Local garage door dealers and supply houses sell higher quality cables and can help you match the exact length based on door height and drum size, which is important because too short or too long cables cause the door to be unbalanced or come off the drums. Online retailers such as Amazon, eBay, and specialty sites like DDM Garage Doors, North Shore Commercial Door, and Garage Door Nation offer wide selection of galvanized aircraft-grade cables in various lengths like 8 feet, 12 feet, and custom sizes, costing 10 to 30 dollars per pair, often with swaged ends. When buying, you need to know whether you need torsion cables that attach to bottom brackets and wind around drums above, or extension cables that run through pulleys. Professional installation is recommended because cables are under high tension when springs are wound, and improper installation can cause the door to fall. Many professionals include cables in spring replacement service costing 200 to 600 dollars.
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