Hi -I’m a calligraphy student and am trying the same but using either a Nikko G /Tachikawa G nib to replace the original nib on a Jinhao X750 - so far no success on either . They are both too rounded and won’t push in to the barrel . Is the Zebra g a different shape or is there any way too adapt either of these nibs as both produce a much better result but my issue is also with the constant need to dip .
Regards
Chris