The newer frames already have that circular cutout from the factory. I don't know why. The above information is correct. With the skeletonized hammer, a lighter spring of flat or coiled, can set off primers because it can get the light hammer up to speed faster than it can get a heavy hammer up to speed. There are upper and lower limiting factors on both hammer weight and spring pressure.
It follows that with lighter mainspring pressure, it will take less force on the trigger lever arm to cock and fire the gun in double action, and a lighter rebound spring to return the trigger and rebound the hammer, again reducing trigger pull weight.
Still, no one has ever addressed giving the trigger more leverage on the hammer, or giving the hammer more leverage on the mainspring since 1909. All the current revolver actions and aftermarket hammers are still based on this 112 year old patent, except for the Colt Python type action which never even made that improvement.
I think the holy grail of revolver smithing is a really good DA trigger, which has so far remained elusive. Everything else about modern revolvers is highly refined. It's long overdue for the trigger pull to be as good as the rest of the gun.
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