I have a S&W Model 64-6 that I ONLY use for range shooting and learning about revolvers. I took it completely apart, thoroughly cleaned it, and replaced the the original mainspring with a Reduced Power Power Rib mainspring from Wolff. The DA trigger pull is really nice and smooth and noticeably lighter than before. I also replaced the original rebound spring with a 13 pound reduced power rebound spring - the SA trigger pull is now VERY light - I MEAN VERY LIGHT - I'm OK with it like that, but I just wanted to clarify that changing the current 13 pound rebound spring to a 14 pound or 15 pound reduced power rebound spring should make the SA trigger pull heavier than it is now, right? I didn't do any polishing or "tuning" of the internal parts related to the trigger engagement surfaces - just the spring replacement. Thanks !