Then I bought a Lamy Safari on a whim and realized I could barely hold the thing. I did some reading and found out I was using the “lateral tripod pencil grip”[1], but the shape of the Safari’s wedged end really wants you to use the dynamic tripod grip. I fought through forcing myself to adjust the way I hold my pen for a couple of weeks, and what do you know: it really did end my hand cramps.
Ballpoint pens push you to hold them vertically. Fountain pens work much better at shallower angles. The difference in grip, and angle, and much lower writing pressure makes a huge difference (for me) in writing comfort. After trying and giving up fountain pens a few times, now I’m sold on them.
[1] https://www.ot-mom-learning-activities.com/correct-pencil-gr...