Commercial bolts have hole in the cocking piece , .But if he didn't drill one, the option is to hook the that piece on a some wood and pull the bolt exposing the firing pin and put a washer that you have slotted or even a dime in the gap.
This^^^^, if it doesn't have the hole. I've run into many commercial 98s that don't.
I usually use the edge of my work-bench top--one reason it's kind of dented here are there. A penny will generally work as well as a dime.
