[Jim Sims]

I dismounted two old springs and installed two new springs myself following instructions (the "tools" consist of two steel bars the correct diameter and length) that came with the new garage doors I was installing. It ain't rocket engineering but you have to know what you're doing (think/plan ahead, react ladder with fastened brace, have coupling tightening tools at hand with a helper to tighten, etc.) and pay attention: one has a "tiger by the tail" during the unwinding/wind up process. If it goes wrong one can get badly hurt. Your installation appears to be missing the red or orange warning tags about inadvertently loosening the the spring to shaft coupling.