Mike. It really bothers me that I can't figure out how the action was originally set up to function.
I made a series of inertial firing pins over the weekend including one that allowed the rear of the firing pin to extended to the striker and tip to extend .100" beyond the breach block face. With and without a retracting spring, the best it would do is to create a small dimple in the primer that did not fire the primer. I've come to believe that the firing pin is too light to properly function as an inertial firing pin.
I wanted to avoid any action changes but it looks as if It might need one to function. I made a fixture to hold the action parts so that I can test any changes without the frame obscuring something. It was very helpful in testing the firing pins.
Gunwolf. Thank you for Dieter's information. I'll contact him.
Otto