Just as an FYI.........

If you use a folded up piece of paper as a shim to lay across all 6 shafts on a jo jan between the shaft and clamp, you get MUCH more precision results. This is what I do with mine and it doesn't take any more time and works awesome. Before I did this I would have occasional problems with the back of the fletching not getting the even contact I wanted unless I fiddled with it.