I had a colt LW commander that built in PRE 68 and the frame got a "kink" in it from shooting 230 Ball with 7.3 grains of Unique back in 1979.
I took it to a "gun smith" and he charged me 40 bucks to straighten the frame. BEFORE he got it, it would stove pipe one in 7 rounds.
When he got done it would stovepipe 7 in 7 rounds!! I put a detonics spring in it hoping to cure problems. Hell, I was 32 years old, didn't have arthritis in my hands, pumped iron, and that slide was HARD to retract.
I ended up trading the gun off to a dealer who was ecstatic that is was a pre 68 model and LW meant "Light Weight". It was an alloy frame. I traded it on a gov't model series 70 Mark IV. That Gov't model, and my kimber polymer target 1911 both use the 16 pound spring ...wolfe brand listed in the dillon catalog. They work fine and you can even retract the slide when you are pushing 80 years old and have arthritis. !!