Adjustable "Six Shooter" Drill Guide MKII

Did a 90% redesign of the drill guide, and this is hopefully now the final version.  The current design is set up for 5/64, 9/64, 11/64, 13/64, 15/64 and 17/64 drills, but of course these holes could be themselves drilled out to larger sizes.  The "cylinder" will be swappable pretty easily (though not as easily as I had hoped).  It will still require removing a nut, a washer and a spring to do the swap.  I'm printing a few test parts now to verify that I provided enough clearance for the threads and other parts, but if it works, I think this will be done.

Update 1/4/2019 - well this was not the final version, but close.  I have mostly wrapped this one up and posted it here.  It is still a "work in progress" but once I get the fence printed it will be done (100%, officially and for sure... done).