ht tp://www.pirate4x4.com/forum/outdoor-sports-recreation/1330106-mosin-nagant-build.html
remove the space and have a look at this thread from a 4x4 forum, I'm not posting the link because I like what he used for the bolt knob, but just to show an alternative method that can be done, or you can have done from any welding shop in the city that does small jobs. The shop next to modern motors on blackfoot should be able to do this, though they were a bit pricey for some work I've had them do, they did do quality work.