The heavy torsion spring above my double garage door snapped with a massive bang last night, leaving the entire metal door completely jammed shut and trapping my car inside. I looked up a few tutorials and figured I could just wind up a new replacement spring myself using a couple of steel tension bars. Honestly, I have never been more terrified doing a home repair in my life because those coils hold a ridiculous amount of explosive energy.
The setup process was an absolute test of nerves. You have to insert these solid steel winding bars into the cone of the spring and manually turn them quarter by turn to apply the tension, keeping your body completely out of the flight path in case the bar slips out. My hands were shaking so bad from pure adrenaline that I could barely keep my grip on the pipe wrench. Every single click of the metal coil sounded like a gunshot in that tight garage, and I was sweating bullets thinking about what would happen to my fingers if the spring snapped backward.
Locking down the final set screws into the center shaft took way too much strength because my arms were completely exhausted from holding the tension bars steady for twenty minutes straight. When I finally let go of the bars and pulled the emergency release rope to test the door balance, the whole frame vibrated heavily, but it actually stayed perfectly level mid way off the ground. The door opens smoothly now with the automatic opener and the car is finally out of the garage, so the mechanism is fully operational again.