"I had already performed a trigger job on it to minimize the SA takeup. The recoil spring I used was from Wilson Combat. It's a 22# flat wire spring which is a little longer than the stock spring, but it fit well and still allowed the slide lock to function, so I didn't cut it down. The part # is 10SEN22, made for their 1911 Sentinel. Another company that makes flat wire recoil springs is ISMI, and you can use the 20# Sig 239 recoil spring. Part Number is GC26."

I'm currently trying the same Wilson Combat spring in my CS9 ( originally bought a couple wilson springs for 4513TSW, but then the Sprinco spring set came along ). Cut down the spring to 16+ coils like the original, and it feels right. I certainly wouldn't mind Wolff springs supporting more of our 3d gens, but at least there are a few alternatives to try.
Brent