This year I decided to do the NaGraNoWriMo project with a brush pen, instead of felt pens like last year. This was instantly a mistake, since our town is going through a "brush pen refill drought", with several of the current cartooning students having decided to ink their entire thesis with the Pentel Pocket Brush.
A pack of refill cartridges at the store in town is $7 here, and the Platinum Fountain Pen Converter only cost $7.50, so I decided to give it a shot.
It doesn't fit my Pentel Pocket Brush, but fits the Kuretake no.8 (and its pricier cousins, the no. 13 and no.40)
I don't like the Kuretake as much as the Pentel Pocket Brush. They both have hair tips, but the Pentel has a nicer point, and the belly of the brush isn't as full with the Kuretake.
Filled it up with Speedball ink. Hope this doesn't clog it up in the long run, I should buy some sumi ink.
Here's the assembled pen and a doodle. Everything is working fine for now, and I'm happy considering the price, if I use it five times it'll be worth it. I'll post more if I encounter any problems.