I lost a spring about a month ago and did not have a cable run through it. I found it in the opposite corner of the shop 50 ft. away. Fortunately it missed everything causing no damage mostly my tractor(tractor related)which was only 3' from where it landed.
I installed many overhead doors over the years. Lift the door to the open position enlist help if needed. Block track with a pin through or vise grips so that it stays up. Easiest way I know is to use S Hooks on the closed ended springs and close them down so they don't fall off while installing. Even the cables out so they can lift evenly. Many of them have cable stays for the ends that connect back to the track bracket if not you can weave the cable through the holes. I will use s hooks there too so I can pick which hole to use easier.
Hook the fixed end run the cable through the pulley and select fastening point with spring slightly extended. Usually the right tension is when the springs start to pull the door open farther. Release the pin or vise grips to see if it stays put and not drop. If the cables are set evenly the door will set firmly and level on the floor and won't put pressure on one side more than the other. If they are not even they can wear the rollers as it is pulling one way or they other. Definitely put safety cables through the springs and I should have said to do that when initially installing the springs. they will also keep the spring up making them easier to get ahold of when standing on step ladder.
The only thing that scares me about this is that the hardware or big box stores don't normally handle anything other than spring for 7' high door. I ended up at a overhead door company for the right springs. They need to know the weight of the door with everything unattached closer, springs and so on, and the height of the door. Bathroom scales will work. 7' spring will work on a 8' door but will fail prematurely and make it difficult to adjust the door easily.
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