With sincere apologies to the fine craftsman and machinists involved, I think this thing is going off the rails with complexity. When done, everything will be concealed except the top of the band, the slots cut in the wood and the bottom screw with its' escutcheon. What goes on "in the hole" could (should) be as simplistic (even fugly) as possible, especially for those who just want a barrel holder. Adding the swivel to the mix might introduce additonal issues, depending on what style is used. Just my .02 - wish I could work on this at the bench, but my "shop" (such as it is, i'm only a tinkerer) is not available at present, nor will it be for several months.