Let me clarify that I do not claim to be a Machinist! On my first attempt of making a revolver cylinder I thought that after drilling the center hole and turning the cylinder to the proper diameter that the cylinder bores was the next most obvious step. But a Master Machinist of 27 years told me to cut the Bolt Notches first, then to punch each Chamber Center through the firing pin hole. That works perfectly with a modern revolver because it does have a firing pin hole, but what do you do on a cap and ball revolver? You locate the Center of Bore from through the barrel. The Timing Cuts seemed like they were going to be a nightmare but they were not as critical as I thought that they were. What has been your own First Experience Of Making A Cylinder? I surely do need a lot more information than I currently possess on this subject.