I wonder what you mean by 'had trouble screwing the cap on'. The jrG2 has a very different problem from the 1st version. In the first one, the thread fit was either too tight or too loose. Can you describe exactly what problem you are having? I definitely agree it is not perfect. The problem I see is thread pre-alignment. Is that what you mean? To start a pen cap, the barrels need to line up straight. Many kit pens are pretty fussy about getting the threads started. Often you have to turn counterclockwise while pressing the parts together lightly, until you hear or rather feel a click, then go forward. I find this very frustrating, and it's a design problem. Many earlier kit pens had that, but in recent years, manufacturers seem to have caught on. The original El Grande had this problem, then they did a design revision, and, it was fixed. Now the jrG2 has a similar problem. Luckily, it can be fixed by the penmaker that cares to go to a little extra trouble. See my article posted at yahoo penturners http://groups.yahoo.com/group/penturners/files/Special%20Techniques/Improving%20a%20jr%20Statesman.pdf
I made Craft Supplies USA aware of this, and they are working on a fix with the manufacturer so the extra work won't be necssary (no outlook in terms of timing)
I think thread pre-alignment is an essential prerequisite for making a high quality threaded-cap pen. The best kit ever for that (that I have encountered)is the Ambassador from woodchuckers. Not a perfect kit, but great threads. Gentleman is a newer version out of the same stable, and not as good for threads (though a better kit). Manufacturers need to learn that this is really important, if they want to push prices up. Seems like there is still a lack of awareness, or such a design as in the jrG2 would not hit the streets.