[farmerted]

Doc Hoy's comments are more correct than my original response. I did have a machinist assisting me, he did have a jig that we set up to hold the arbor vertically. We used a milling machine, a drill press will usually have too much "slop" or movement. I had to do the actual process, with guidance from the machinist, as he did not want to dink up my pistol. My Belgian was probably not the best choice for me to practice new skills on, but I had researched and called several cowboy action gunsmiths for advice, all very nice men who gave information freely, and I was able to communicate to the machinist what needed to happen. If I can find my contact info, one gentleman in central CA. was particularly helpful.