So I love my Pilot Custom Heritage 912 with a PO nib. It writes a very fine line but is still quite smooth.
I had always used it on nicer, fountain pen friendly paper. Guess what I discovered when I tried it on cheap work copy paper? It actually does a very decent job of keeping a fine line, with little to no feathering. See a comparison with a couple of other pens, including a Pilot EF.
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Another fun thing you can do with the PO nib is flip it over and use it for some shading or thicker underlining.
The PO nib is still one of my favorites.
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