As promised, here is the Celtic pen. It is for a relative who is very proud of their Irish heritage. See my description of the problem in the post above. To remind you, I was concerned that the tube length was longer than the expected length from most sources. It matched the latest instructions on PSI's website, but that was the only source that matched (2.99 inches). The paper instructions that came with the kit had the incorrect value (2.94 inches). The difference is .
I glued the full length tube in the blank. I used a common pen mill to square the blank and grind the end of the blank down to match the tube length. When I assembled the pen, everything was sized correctly. The tip comes out the correct distance. It writes well and feel good in the hand. It is ready to give to its recipient.
I had made several pens from bog oak a few days prior to this Celtic pen. I was not happy with the way that the CA finish darkened the wood so much that you could not see the grain, so I used Hut Crystal Coat friction polish on this pen. I like the way the Irish bog oak looks and feels with Crystal Coat compared with a CA finish. (I know that Crystal Coat is not as durable as a CA finish, but it doesn't matter so much with this pen.)
Thanks for reading.