Does anyone know if the vanishing point feed can be removed from the metal unit? I like to tweak feeds by deepening the ink channel, and I can't tell whether the channel ends at the transition to the metal collar, or continues under it. If I go to the trouble of deepening the part of the channel that is exposed when I take the nib off, I wouldn't imagine that doing that will have any effect on increasing ink flow if the part of the channel under the collar hasn't been deepened as well.
Also, I usually shove a razor blade down the slit at the same time, and the combination of those two tweaks seems to increase flow nicely. Anyone out there have an opinion on whether the tweak to the feed channel is not really doing anything and just the tweak to the tines is what gets me the result?