It sounds like I was mistaken. I would have sworn I had read posts about being able to swap specific nib collar/units between a few brands. I've taken a liking to stub nibs, and they need a strong flow of ink. I assumed that using the feed that is sold with a stub nib would probably be wetter and a better fit for the replacement nib.
I have, however, swapped out many Jowo #6 nibs. I've used the Goulet nibs, Nimosine, and Franklin Christoph so far. Thanks.
yes you can swap the nib collar units between some brands, but not Conklin.
The threading seems to be proprietary or at least so far no-one has found what collar fits (Jowo and Bock collars do not fit they have a different threading). Your best bet is pull out nib and feed from your Conklin, change nib but use the same original feed and put both back in. The nib must be a size 6.
My Conklin Duragraph has the same dryness / skipping. I cleaned the feed / nib and flossed the nib (tines seem very tight). I would like to replace the nib and the feed, but with something other than Conklin. Are there entire units that I can screw in to the Duragraph (like an Edison)?
As mentioned above, no. So far a collar with same threading has not been found.
Your best solution is described above, you need to pull out nib and feed (read or watch some videos on line on how to do it, it's not difficult at all) and swap it with some other size 6 nib you like.
I have a couple of the modern Conklin nibs (as shown in RogerW's photo) and they are bad, very soft, will bend away from the feed and cause all sorts of skipping trouble.
Ditch it... and get a spare Jowo or Bock to swap in (Edison nibs also ok, they are rebranded Jowos)