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From that article linked above:
Safety cables are very important to have on extension spring doors. You typically will not need to replace these cables, but if you do not have them, you should consider purchasing them. The cables run through the length of the spring and contain the pieces of the spring when it breaks. These protect people from injury or death, and they protect cars and other valuable items from being damaged when the spring breaks.
I can tell you from experience you'd better have these fitted!
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