I have a Springfield Armory so called Mil Spec stainless 1911. It's got a shelf on the hammer instead of a true captive half cock notch. I can't get used to that, having used too many 1911's with the old style notch. I like it that on half cock the hammer and sear are interlocked, the trigger can't move, the sear can't move, and the hammer can't move. The entire group is disabled until the hammer is cocked. Someone in the group said If that doesn't fit the requirements for a safety, I'd like to know what does. Can I replace the hammer that came from the factory with an identical one with the captive notch without screwing something up? I remember memorizing all three of the safety's on the 1911 way back in ROTC in the '50s. Thanks.