Repairing a garage door torsion spring can be very, very, dangerous. I do not recommend this home repair for anyone. There have been people seriously injured, even killed, winding torsion springs. This is a job left to the professionals, trust me. It is one of those things that if something goes wrong, and believe me, I have heard horror stories, you will wind up in the hospital. There is a tremendous amount of torque on those springs and the winding process can be extremely difficult. Please do not attempt this repair at home!