*this tutorial should be done at your own risk!
i am not responsible for negative consequences.
if you want greater flow, you have to widen the horizontal slot (indicated with a red arrow below).
widen the top part of the horizontal slot.
if needed, widen all the way around.
use tools such:
precision triagle file
precision round file
razor blade (effect may not be permanent, but will last very long time)
i recommend the razor blade, as it is easy to get.
put the razor blade in the horizontal slot and try to enlarge the slot by wiggling the blade.
this will compress the ebonite a bit, and widen the slot.
after widening modification, use a fine tooth brush / thin metal (filler gauge) to clean the ink and air path ways.
over widening will increase the flow even more.
from my experience, overflowing probably won't happen (although, i can't 100% guarantee it).
*remove the nib first, by wiggling it side ways (little bit, not too much) & pulling it out at the same time, then remove the feed.
before inserting the nib and feed into the grip section, make sure the nib is horizontally balanced, when viewed from front.