That's not a problem with renew point feeds, since they can be readily adapted to such needs, and can be part of a set of modified renew point units set up to take on every different type of task. Further, the nib and feed have to work together well for the pen to meet expectations - so I'd envision an artist perhaps having a set of gold nibbed renew point units with different feeds, to properly feed india ink versus drawing ink versus fountain pen ink. Although I've modified my share of ink feeds, I'm just not a "nib meister". I would certainly produce and sell this item to cartoonists and sketch artists, but the real key is the gold nib and it's interaction with the Esterbrook feed. In summary, the result of using a modified Esterbrook CA101 should be (1)a lightweight pen, (2)capable of being carried in the pocket, (3)easily taken apart for cleaning using threaded connections, (3)that is cost-effective, in fact cheaply obtained, and (4)which readily and rapidly accepts additional/different ink (almost sounds like a patent application, doesn't it?). The pocket clip on these models tends to be harder on your shirt fabric than earlier Esterbrooks, so that also makes them less popular. So virtually no one wants the cartridge filling models. And CA101's are relatively cheap because the exact same Esterbrook pen was also produced with a built-in aerometric filling unit. ![]() I simply couldn't get over how "functionally equal" the Esterbrook CA101 is to the Artpen. I've sold 3 Koh-i-noor Artpens in the past year or so (the FPN Artpen thread includes a picture of one of them) so I'm eminently familiar with their construction and cleaning, but not how they're actually used. This is virtually identical to an Artpen. So the CA101 comes apart easily, via threads, into six parts: cap, barrel, cartridge, section, cartridge nipple, and gold nibbed renew point unit. And the center of the cartridge nipple is large diameter, to properly support inks which are less fluid than ordinary fountain pen inks. Unknown to some, the CA101 cartridge nipple can also be removed from the section, out the nib end. (And Sheaffer cartridges are still commonly available.) That allows me to thoroughly clean the cart's after each use, to rapidly change inks, and to reuse the cart's for an extended period of time. Also, I reuse the cartridges by cleaning and refilling them with a plastic veterinary syringe. The secret with Sheaffer cartridges is to pre-puncture them before insertion, since the Esterbrook cartridge nipple is pretty wide and deep. But I have some black Staedtler drawing ink which I'll be trying shortly. ![]() I use Sheaffer cartridges, and at the moment Sheaffer ink. The CA101 Estie barrel also unscrews at the barrel/section joint, similar to an Artpen, to access the area for the cartridge. Vintage gold nibs are flexible, from semi-flexible to "wet noodle", and available in your choice of nib widths/lengths, so long as it's a #2 or thereabouts. Thus the nib and feed come out just as easily as the Artpen, for cleaning. Convert the renew point unit to a gold nibbed unit (there's a thread elsewhere on FPN, to which I contributed, explaining how to do this, and I have already made 3 or 4 gold nibbed renew point units which I'm using). (Crescendo of trumpets here) Just use an Esterbrook CA101 cartridge filling fountain pen. It developed because of some absolutely inexpensive Esterbrook pens I purchased at the DC Pen Show a few weeks ago, and my conversations at the pen show with a guy seeking a Koh-i-noor Artpen for his son. I just don't see any downside to this ink.Here's the "vision". ![]() It also dries fast to a matte surface just like the Black Star Matte. When you use it on white paper, the contrast is striking. I've tested more than a dozen black inks and the Black Star HiCarb is the darkest. Martin's Black Star HiCarb India Ink is the one to get. If you want the darkest possible permanent ink, Dr. The ink is waterproof and resistant to erasing. Interestingly, the label on the bottle says that it can be used in technical pens as mall as 0.134mm. It's pigmented, made from 100% carbon black pigment. The ink comes in a 30ml bottle with a dropper. It's really quite amazing to see an ink so black. This is also the darkest compared to all other black inks I've reviewed. It's darker than both Black Star Matte and Bombay Black. Martin's Black Star HiCarb India Ink is the darkest black ink from Dr.
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