Hi guys. I hope this doesn't come off as a silly question, but I just finished machining the 3.000" od on the breech casing and noticed the .015" flats that need to be machined on each side. If I mount the side arms to this with their .375" width, I'll have a overall width of 3.720" when the print calls for 3.750". Should I have turned the breech casing only to 3.030 and then machined the flats, do I add .015" shims to each side, or am I missing something completely obvious? Any advice would be helpful.