Ok so here is about 7 hours of work... These things really do suck in more ways than one. This is (obviously) about the hardest pen build I have ever had. The pen ended up WAY too long (I'll remedy that on the next one ). It ended up 6 5/8" long capped... oops. Its still 6 inches long uncapped, but surprisingly comfortable to write with. If you are wondering what the black tint is... its my over zealous need to throw in some x feather and see what happens. And it actually does work. It sucks up ink and everything. The nib is a fine point polished bock (haven't figured out how to do the JOWO feeds with the breather tube yet). The sack is a #17. The next one will have a shorter sack... I just guessed at the size this time and the next one will have a different connection/nipple mechanism. There are a few other things I will probably do different, but all in all I do feel like I just climbed a big ole mountain. I would love to hear what people think. I would love to hear about anybody else's issues making and designing pens like this. In particular I would really like to know how big the reservoir is on everyone else's (Mine ended up being around 1 3/4" long and 11.25mm in diameter). I think I made mine too big which is what contributed to the excessive length... that and sack size. Enough ranting please comment.