If your hand is getting tired because you're applying pressure to write, then something else is wrong. Modern gels and rollerball pens take almost no pressure to write. Ballpoints with hybrid ink are the same. The weight of the pen itself should be sufficient to write.
Perhaps the way you hold your pen is incompatible with the balance of your pen?
My hand doesn't get tired. My thumb becomes wracked with pain. Big difference.
I did say I had a hand injury. Specifically, I broke my thumb in multiple places. The reality is that even when broken bones heal, they're not the same after that kind of injury, they will never be the same again, and no amount of physical therapy fixes it. It's not like my thumb is useless now. It does nearly everything it should. Prolonged writing with a BP is not one of those things, though.
Same thing with my voice after thyroid surgery. While I could talk again like usual (and as much as usual!), I lost my singing voice (especially all of my high range and nearly all mixed registers), and it's unlikely that I'll get it back. But it was get the thyroid surgery or die. I chose to live, and take my chances with my singing voice. It didn't work out as I'd hoped, but that's the way the cookie crumbles.
Even Signos and Jetstreams don't write as smoothly as FPs, because they still require friction to write, to get that little ball inside rolling, and it is the friction that creates the pressure that makes writing with those pens difficult to impossible for people like me. You still have to bear down to get them to go, even if it's only slightly in comparison to "normal" ballpoints. Yes, I can write longer with a Jetstream--but only longer relative to traditional BP pens. It's still not as long as I can write with an FP. So maybe I can handle one college class with a Jetstream, but the second class after it? Not happening.
Until you've had a hand injury like mine, you can't begin to comprehend how even the slightest pressure like that can create excruciating pain--or how quickly it can happen.
That's why I use FPs for classes now, whenever possible.
Edited by Aquaria, 18 January 2018 - 13:25.