Credit to Bruce Robbins.
The CAP
I drill the cap with a 7/16" drill for the male tap which I hold in a "Tee" handle and hand tap the threads. I tried putting it in a Jacobs chuck in the tailstock and hand turning the headstock but couldn't get the proper "forward thrust VS turn" down pat and ruined several threads. I squirt a little WD-40 on the tap and it cuts into the acrylics nicely. I simply look down and align the tap with a straight line on the lathe bed. If you find a better way be sure and share your success.
The bottom
I found that turning the blank down to .466 gives me a nice diameter to run the die up on, again being hand held in a die holder and a squirt of WD-40 allows for fine shavings to curl away. Once arriving at .466" and finding that it worked, I haven't experimented since so there could easily be a better diameter for the threads. Again, if you find a better way be sure and share your success.
I drill with a "Q" bit then tap the inside threads with a 10mm X 1mm tap first then screw in a dummy threaded rod I made from maple to strengthen and support the inner nib threads while threading the larger outer cap threads. The nib threads are sloppy but not any sloppier than the kit threads.