This is an interesting old thread, I am happy it was resurrected.

I have a 1st Gen Colt SAA circa 1904 that has been changed to a .38 Special with 2nd Gen parts. It's been fired a lot - so much so that the cylinder ratchet has peened the recoil shield. It's got about the smoothest and lightest cocking I've ever felt on a SAA.

Part of that is from use, but it also has a mainspring that has been worked on. It looks like someone used a flat file to round off the back side of the mainspring so that it is a convex arch from side to side. The spring looks very old and I know I've shot it plenty of times with no issues.

The gun is 100% reliable and I've never had light primer strikes. It makes me wonder if a S&W mainspring can be modified the same way.

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My sgntr is mor thn 30 chrctrs