Just replaced my first recoil spring on a 1911. Why didn't they tell me that I needed 4 hands? Ended up having to call in the wife for help, hardest thing I had to do. Taking it apart was no problem, no holes in the wall as the rod goes flying. But putting the sucker back together, fun. I am sure that after doing it some ungodly number of times it will get easier. When Kimber said it the spring needs to be replaced at 800 rounds, they weren't kidding. The spring was at an odd angle when I got it out. Now to range test it.