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**Pen details**

Pen: Retro 51 Lincoln
Nib: Fountain Pen Revolution 14k ultraflex EF
Feed: The Good Blue polymer feed

I’ll probably post separately about this setup as it’s quite interesting.

@paradoxmo That is interesting that the Good Blue’s feed works with the FPR nib in yet another brand’s pen. How’d you figure they would work together?

@jezlyn the Good Blue and FPR both use Kanwrite nibs and housings. The Good Blue feed is made in house but made to fit in the same housing as the other nibs, so the format is compatible.

I had some inside info on this from TGB’s proprietor, but it’s fairly obvious if you just compare FPR, Kanwrite, and TGB’s JoWo compatible nib units that they are all the same.

@paradoxmo TIL! I have only played with FPR nibs and was annoyed to find out how different the feeds were from regular feeds, so I couldn’t use the feeds in the pens I wanted to experiment with. I’ll have to learn which pens can handle such feeds. Amazingly I was able to put an FPR nib into a TWSBI GO using the TWSBI feed. Works decently.

@paradoxmo The JoWo and similar feeds that I’m used to have a nub that seats into a short tube at the bottom of the housing, but the FPR feed doesn’t have that nub; it’s just flat at the bottom. I assume the TGB feeds are the same? Assuming such feed would fit into a housing I want to use, would the ink flow properly? That’s what confused me when I bought the FPR nib and feed and saw the feed.

@jezlyn they have a separate version that’s JoWo format/threading with the feed post. It’s compatible with JoWo pens but doesn’t take the JoWo nibs, but the Indian nibs instead.

@paradoxmo I see. So the FPR flat-end feed wouldn’t work with a JoWo housing (which I assumed).

@jezlyn yes the flat end feed only works with the 5.1(?)/ 6.3 diameter Indian pens.