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why drill a frame to deal with a broken hammer spring? Why not just strip the gun and replace the spring?
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A weakness of the Colt SA design was the simple leaf spring that forces the hand forward against the back of the cylinder and into the cylinder notches so it doesn't slip out while turning the cylinder. The spring needs to be carefully and properly heat treated, otherwise it can become brittle and break prematurely. This was, and still is, a common failure.
It's a simple thing to replace the hand/spring assembly, but if you get a run of springs with poor heat treat it can be a bit costly and it is a real PITA. Ruger's design is much, much more reliable, using a coil spring and plunger. The coil spring is quite a bit more reliable. Once the Ruger design has been implemented hand spring failures are virtually unheard of.
Yes, replacing the Colt designed leaf spring is simple. Until you get tired of having done it several times. The Ruger design is simple to install and fixes the problem forever. Very tempting thing to do.