As promised here is a simple expalnation of how i did the pen.
It is quite easy to do, everything was done on the lathe.
As normal drill your blank, but before you take it out you will need to do the following.
For the pen, you need to make a recess that the cap thread coupler ring?? will fit into. Then it can be turned using your closed end mandrel, i did not use any bushings for this just used my calipers, this one is 5/8ths in diameter.
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For the cap
Again drill the hole, but now you will need to glue in the tube, don't take the blank off the lathe unless you can put it back on in exactly the same place[

]. Once set glue whatever accent ring you want to use on the end, mine is brass. Use the tail stock to apply pressure for a snug fit. Then drill a hole smaller than the first and by using a small round metal file with the lathe running you can file down to the inner diameter of the tube, i then polished the end before i did the turning.
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Assemble as normal for the pen, for the cap you just use the black threaded plastic piece which is glued into place, screw onto pen first and then slide into the cap for perfect alignment.
Now get going and lets see all them pens[

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