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Here's a thought... if stoning the surface removes a case-hardened layer wouldn't using the trigger then eventually case harden it again? What have the detrimental effect been after stoning? Any experience?
Metal doesn't work like that.
Case hardening is a process that adds carbon to the surface and gives the metal an almost glass hard surface layer while keeping the metal underneath in a softer state so it won't shatter.
Using the trigger can in no way "re-harden" the metal because that can't re-do the hardening process.
Since the metal underneath the case hardened layer is soft, when the metal is stoned and the layer is broken through, this exposes the soft metal.
Being soft, it can't maintain the critical angles and the parts quickly wear.
The wear can cause any number of problems, including a trigger too light and unsafe, a trigger with a heavier, creepy pull, to a trigger that won't stay cocked.
Since the exposed metal is soft, it can't maintain it's shape and the trigger pull will constantly change causing any or all of the above conditions as the metal wears.
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