Folks always bring up that the Ruger has all coil springs. No doubt this is a better mechanical design than the original Colt leaf springs. (A coil spring is exactly the same as a leaf spring except that it's longer, so a given amount of spring deflection is spread over a much longer length of spring, which reduces fatigue and work hardening of the spring.)
The most commonly-broken spring in a Colt or Colt-clone SA was the hand spring.
I just bought a new Cimarron .45 Colt, and when I got it I stripped it down to give it a good inspection and cleaning. I discovered that it has a Ruger-like coil hand spring! (I also immediately ordered a spare spring, plunger, and retaining screw - those puppys are tiny, and I bet they can easily get away from you and get lost in the gun-spring-eating carpet in the man cave.)
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