In doing this fix myself, I bevel what I would call the "left" side of the sear button, left being described as the left side of the pistol as I hold it in normal sighting position as if to discharge it. As Hugh said in post #13, idea is to get the button to go under the trigger bar, or in my view trigger bar to ride up over the button as the receiver returns to firing position.
That said I was able to restore proper function mostly by beveling the trigger lever, with very little new bevel applied to the plunger ("button"). Hope this helps.
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