Borg,
Are? you're talking about compressing the spring to remove the cocking piece and spring.
I have a Menck firing pin removal too for a 700 Rem. It ahs the hole in the compression bolt like a Kleindorst. What I did was make a pin that fit into the hole in the tool, I think it was 3/16" or so and had a shoulder, Think about a nail with a head in the middle. The head is the shoulder in the center of the pin, fits against the bolt in the tool and keeps it from deflecting, then I tapered the pin that pushed against the firing pin body just enough so it missed the firing pin when it pushed against the firing pin body, and of couse it's about 50/1000ths longer than the firing pin. I made mine from a grade 8 bolt so it would be stiff and rigid. A friend of mine has a Kleindorst tool set up the same way and it works fine.
*Trying to use one of the tools unmodified is a sure way to break a firing pin, as you probably already know.