Richard sent in his garage door torsion spring replacement project – “Dangerous, illegal, or just the ultimate do-it-yourself project? They said it was a job for “professionals only”. They said you’d wind up in the emergency room, or worse. But I had the Web. I took the ultimate do-it-yourselfer’s risk. How I Replaced Deadly Garage Door Torsion Springs And lived to tell the tale. Warning: advanced theory sections could be applied to designing catapults and the like.”Link.