(This page revised August 2, 2018)
The ability to change nibs in your pen by simply screwing out one nib unit assembly and screwing another in is a great feature. But if you’re not careful, the nib can shift on the feed. This misaligns the tines, and the nib will suddenly be scratchy or exhibit poor flow control, or both.
(This feature is often thought of as peculiar to Pelikan, but Pelikan isn’t the only pen brand with interchangeable nibs. The instructions here also apply to many other brands and models. But note that most pens other than Pelikan’s Souverän and Tradition series use a cartridge/converter filling system. You should remove the cartridge or converter from one of these pens before removing the nib unit.)
To remove the nib unit from your pen, hold the pen in your “weaker” hand. (If you are right handed, this is your left hand.) Place the ball of your “stronger” hand’s thumb on the top surface of the nib and wrap that hand’s index finger around underneath the feed to cradle it in the joint closest to the fingertip. (Cradling the nib unit in this way provides better support for some nibs’ fragile feed fins than holding it with your thumb on the feed and your finger on the nib.) Squeeze firmly, applying pressure to hold the nib and feed together, and then “unscrew” the pen, not the nib, with your other hand until the nib assembly comes loose. If it seems really stuck, stop! Soak the nib end of the pen in cool water or INDY’S IDEAL PEN FLUSH for a few minutes, and try again. Once the nib assembly is loose, unscrew the pen the rest of the way.
To install a nib into the pen, reverse the above procedure. Screw the pen onto the nib until it stops, and then “tweak” it just a little further so that it turns against resistance. The ideal installation has the nib firmly finger tight, neither loose enough to work its way free nor forced until the pen “cries out in pain.”