I LOVE these technical challenges.

Just a thought...

Building up the area of the drawbar where the trigger hooks engage would certainly move the trigger (and consequently the SA pull) forward in the trigger guard, but that would also do the same to the DA pull.

I wonder if building up the rear of the drawbar (where it pushes against the sear to release the hammer in SA) would not have the same result without changing the DA pull?

Also, not to nitpick, but only the 9mm and 40s&w TSW models were fitted with the "delayed unlocking" (by means of decreasing the angle of the barrel and frame de-camming lugs by approx. 2 degrees).

The 45 standard and TSW models share the same cam angles.

John