5.1 With the cables still tight on the drums, mark the drums and torsion shaft at each end with a file or a marking pen. If at least one of the springs is still wound, don't touch the cable drums and don't grab the shaft. If the cable breaks, the drum could spin and the cable rip through muscle and bone. If the set screws aren't tight enough, the shaft could spin and cause injury.
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