Well, the new firing pin is clearly the wrong part.
I would take very fine sandpaper and spend a while polishing the old pin at the shoulder where the taper begins. Don't change it, just shine it up. A light strike means that, for some reason either the hammer isn't hitting the pin hard enough or something is interfering with the pin travel. The pin may be contacting a burr or some corrosion inside the firing pin bore that limits its travel. Perhaps replace the hammer spring as well. Maybe take a picture of the exposed action and post it. The problem might be obvious to one of us.
As a minimum, you should check the firing pin protrusion - its substantially more than on rifles (60 to 70 thou?).
Well, the new firing pin is clearly the wrong part.
I would take very fine sandpaper and spend a while polishing the old pin at the shoulder where the taper begins. Don't change it, just shine it up. A light strike means that, for some reason either the hammer isn't hitting the pin hard enough or something is interfering with the pin travel. The pin may be contacting a burr or some corrosion inside the firing pin bore that limits its travel. Perhaps replace the hammer spring as well. Maybe take a picture of the exposed action and post it. The problem might be obvious to one of us.
Wow, your a much braver gun nut than I !
The inside looks pretty clean considering the age.
Did you flush it out before dis-assembly?
Don't have much to add other than to suggest remain positive in your search for the solution.
Hopefully someone here can send you in the right direction before the answer comes from south of the border.
Rob
Just got up to date with your problem. If you have a drill press (or put a drill in a vice) you can shape your pin. Just a thought.



























