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@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.