Most home centers don't carry all the replacement parts you'll need for garage door spring replacement, and most garage door service companies won't sell you springs. So you may have to order the parts online and wait for the shipment to arrive. Garagedoorpartsusa.com and stardoorparts.com are two online sources . First, inspect the condition of your cables and brackets. If you see any frayed strands on the cables or rust on the bottom brackets, replace them now before they fail. Bottom brackets cost about $15 per set. Premium-quality cables (listed as “7x19”) last much longer than economy cables and cost only about $4 more. So it's smart to buy the better cables for about $12 per set.
9.9 Go to the other side of the garage door and insert the end of the cable into the drum. Rotate the drum until the cable is tight. Slide the drum against the bearing and push the shaft to the right. The marks should line up. If they don't, figure out why and correct the problem. It could be a stuck cable, the garage floor may have shifted, or the vertical angle that helps support the bearing plate may have loosened and shifted. Many garage doors have been installed with a gap between a drum and a bearing plate. The cable drums should always be flush against the race of the bearings.
Although garage door springs can break during any season and at any time, they most commonly break during the winter. This has to do with the temperature change. When the temperature sinks below a specific threshold, the metal will contract. This means it’s extremely possible for your door springs to shrink slightly during the winter months. This is hard on the springs and makes them more likely to break. https://youtu.be/Z_eZc-kh40c