I believe that stock repair at the recoil lug was done by Bill Reed. I looked through the notes in my notebook & didn't see anything though. I'm not 100% sure, too many years ago, lol.
It's a common problem when mating a mauser cockpiece to firing pin, it's all in the dimensions/tolerances. I had the exact problem once with an armorer's pin. I carefully mounted the cockpiece in a vice, lubed up the pin lugs, & slowly got the firing pin worked on using a small wrench on the...
Ok, these I decided to keep, but really didn't want them to be public knowledge. My three KM '01 DWM Gew98's, consecutive serial #'d, all 3 to the Ist Seebatalion. Of course with nice KM lids & 1st pattern slings. Don't even ask for pics...