I have never seen one of these posted on any of the pen turning forums.
This Parker twist ballpoint is huge!
Cap Diameter @ 15/16", CB Diameter @ 31/32", Nib Diameter @ 33/64" and total length @ 6".
Minimum blank size @ 1-1/8" and requires a 27/64" bit for the lower and upper brass tubes.
I could not find any bushings or instructions for this kit, so I turned between centers and used calipers to size the blank for the fittings.
Used a piece of BEB finished with 6 coats of MINWAX Oil Modified Water Based Polyurethane.