I want to make additional quick mention of the Rotring Fountain Pen converter I got for my Rotring Art Pen. First, a disclaimer: this is the first fountain pen converter I’ve ever owned. All my other fountain pens are either cartridge-fill, have a built-in piston fill, or I found with a sac converter already in it. I do not really have any holistic knowledge to judge this item against.
That said, I think this is a good fountain pen converter for the pen I got it for. Fits easily and snugly on the pen, holds a good amount of ink, and I’ve had no leaks so far. I could not get the converter to fill through the fountain pen tip as per these instructions on JetPens–not a drop, I don’t think, went up into the converter in all my attempts–so instead I just took the converter off, dipped the end of it in my ink, and filled the converter before putting it back on the feed. Use of the converter is pretty intuitive (thankfully, since it comes with no instructions), and I had no other problems getting the converter to work. No complaints here!