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Part five:
4. Trigger pull adjustment. The normal P11 trigger pull force is 8.5#. Shortening the trigger length reduced that to about 7.5#, and this adjustment will reduce it further to about 6.5#.
The objective is to effectively shorten the trigger spring so it doesn't require as much force to fire the pistol.
The adjustment involves making a new hammer spring pin with a "dip" in it that anchors the hammer spring 0.075" closer to the slide than the standard pin does. My intention was to use 0.050" diameter stainless steel welding rod for the material. However, I prototyped them from the 0.050" diameter steel wire used to make Jumbo paper clips, and the prototypes have been flawless.
Bend a "v" into a length of wire where the bottom inside of the v is 0.075" below the bottom of the cross bars. The result looks something like this in profile ----v----. Shorten the cross bars evenly so the overall length of the pin is the same as the standard pin.
Using a small drill or burr on a Dremel, relieve the sides of the hole in the hammer spring catch (279) so the v of the new pin will go in far enough that the cross bars seat correctly into the catch.
Reassemble the pistol.
Reducing the trigger pull as in steps 1 and 4 has the effect of lowering the force the hammer applies to the firing pin. Obviously, if that force is too light, the firing pin spring can prevent an effective ignition strike on the primer. The firing pin spring has the job of preventing an accidental discharge since the hammer rests against the firing pin and it's always preloaded by the hammer spring. However, IMO, the firing pin spring's strength is a serious case of overkill so I think it can be safely shortened to give the hammer an easier time of in causing ignition via the firing pin. I've tested 6.5# triggers with the standard firing pin spring and one shortened by clipping 7-9 coils off. There haven't been any problems firing the pistol with either firing pin spring. In a CCW situation, I'm more comfortable with the shortened spring because I don't want the additional risk of light strikes. YMMV
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