S.A. trigger pull has in my experience doing trigger work had more to do with the trigger spring and seer engagement and engagement surfaces a lighter hammer spring may help some but its not going to fix trigger creep or rough engagement surfaces or how heavy the trigger spring is i don't know that a lighter hammer spring will noticeably on a redhawk fired S.A. I know hammer spring weight doesn't noticeably effect trigger pull on a blackhawk but unhooking one arm of the trigger spring will make a HUGE difference however I have no experience doing trigger jobs on DA revolvers so I can't say for sure