Carl, the finish I used on this one was Crystal Wax.
Burning was fairly simple. I drew the pattern on a piece of paper measured to wrap around the pen. Then I taped the paper around the pen and used a sharp leather punch to make small holes along the pattern. After that I removed the paper put on my glasses so I could see the holes
and burned the pattern. The trickiest part is when burning along the pattern when it follows the pith and trying to turn out of it. The fine tip of the burner tried to stay in the pithpath. I am sure different woods will have different issues.
Brian