This will be a quick post, just to tide you over. A time may come in your life where you find an old Pentel brush pen, one that has perhaps been slightly chewed on by a cat at some point in time, a brush pen that you can say with confidence you have not used in at least two years, but possibly five or more. You may shake the brush pen, and hear no liquids jostling within, and you may attempt to use the brush pen and note how dry and barely depositing on the page at all the whole operation is. You may then notice that the brush tip unscrews from the body (in exactly the opposite direction of the way you want it to), so the thought may occur to you, “can I possibly clean out this brush pen and fill it up with a fountain pen ink of my choosing?”
Dear reader, do not fall for this trap you’ve created for yourself. It has been days of me trying to clean this thing out, including use of the magical miracle Rapido-Eze pen cleaner, and STILL there is ink that comes out. If you want this concept so badly, just buy an empty waterbrush and fill it with ink.*
*Note to self: test whether this actually works.
No Pen Intended 
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