The threaded converter ensures a secure connection while the agitator inside the converter prevents any ink flow issues. My pen has a medium nib that produces more of a fine-medium line with slightly dry flow, but not dry enough to introduce any performance issues. I prefer flow to be slightly dry than slightly wet as it’s easier to increase flow than decrease it. Also, too heavy of flow on the wrong paper can lead to feathering, negating the fineness of the nib. So far, I’ve found this nib to be smooth and a joy to use.
At a MSRP of $375, the Mule is at the upper end of the spectrum for pens with a steel nib and Montegrappa is often criticized for not providing as much as value as comparably priced gold-nibbed pens. I think the overall experience is most important than the sum of the parts of the pen so when the Mule performs just as well as, or better than, comparably priced gold-nibbed pens, I don’t hesitate to recommend it. I think it’s the best copper pen currently available. There are alternatives that are almost as good, but don’t quite deliver the same sense of quality, prestige, and performance of the Mule. It’s a pen that’s meant to be carried with you everywhere and, by doing so, will develop a finish that’s unique to you.