Linda Medley, the artist and creator of the comic book Castle Waiting has posted an interesting review of the Ackerman Pens’ Pump Pen (One Fussy and Messy Little Pen! Is It Worth It?). Linda gives a detailed review that should be great reading for any artist interested in different drawing tools , especially those interested in classic dip/nib pens. She illustrates the review with examples she created with the pen for her current in progress comic book.
She also includes a section Make your on DIY Pump Pen.
You can read it HERE.
I went and looked at the aforementioned pentel pen, but bought this ‘manga school’ pen instead. It’s got a resevior, probably easily refillable and a real metal nib. I might try to mod it to hold real nibs which is a distinct possibility.