The Jinhao 20 made it another month before I had to refill it, but this time I remembered to swap the converter out for a Majohn A1 style converter. Now I can actually see the ink level with some backlight, though only when the nib is extended. When retracted, it's blocked by the seam/ring.
Still better than not seeing it at all with the Jinhao converter, and this way I don't have to drill/dremel anything.
I also swapped my Decimo CON-40 for a Majohn A1 converter.
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