I run 1/2 square blanks through my veritas dowel tool, leaving the shafts a little over 23/64th in diameter. Then I have three different blocks made up with a 5/16th, 11/32nd, and 23/64th hole. Made them out of hard maple. As I slide the block up the shaft, it gets very snug and even puts a small edge on the wood ahead of it. I back it off and sand a little and slide the block some more. Takes about 45 seconds to do an arrow and the block puts a real nice burnish on the shaft. This video is the very first arrow I did in the jig, I need to make some minor adjustments to the block at the drill chuck to shorten it way up.