Not wanting to limit the customization of tubeless pens to plastics and readily tap-able materials, I came up with a way to use the tap and die sets for wooden pens. As wood will generally not hold the types of threads we are cutting, I made plastic inserts that would function as tubes and a threading medium. There can be many variants of this technique but here's one where I incorporated a PR insert as the centerband along with a silver accent in olive wood burl. The 12mm tap takes a 7/16 hole, so the o.d. of the tenon on the insert is 1/2". Keeping everything round and drilling on the lathe helps center things and there is still plenty of wood on the outside to taper the cap if desired.
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