pen hacks

Does anybody have any ideas on hacking a pen to increase it’s longevity? I thought of coiling the ink cartridge. Then I could make a very long one. Apparently you can already get spring shaped ones.

They’re claiming they last twice as long.

Rod McKie talks about refilling pens with FW Acrylic ink using a syringe.

I think if I could buy some sort of water based ink and have a large reservoir it would work. I suppose at some point surface tension would stop ruling over gravity and I’d have to worry about the ink pressure. I suppose that could be solved with a float bowl like on a carburetor but that sounds really messy!