Well... Jinhao 159, with a generic Jinhao nib.
Okay. That top line is disgusting, but I made my Jinhao nib flex. Yes, it is prone to springing the nib if brought too far, but so far, the modifications on the nib are looking okay. The middle line is it's "average" flex (without any risk). The bottom lines however.... that's a whole different story. Right next to it, I compared the flex to a Canadian Parker Vacumatic. 1 millimeter to 2.5 millimeter flex average. The really crazy ones go up to 3 millimeters.
Edited by Thy, 09 July 2019 - 01:20.