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I've been using a Pilot Metropolitan pen with an F nib and a screw pump converter cartridge which was included with the pen for quite a while, and for all this time it has been intermittently stopping to flow ink properly.

It's definitely not a case of ink drying because it usually happens during long writing sessions, and fixes itself immediately if I turn the screw to push out some ink. My gut feeling is that it's either air bubbles get into the flow somehow, or, conversely, the air pocket I leave inside the converter is way too small and creates a vacuum when some of the ink flows out.

I have used other pens in the past, most with F-adjacent nibs and don't recall this happening on any of them except this particular one.

What can I do to prevent this?

Tigozawr
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1 Answers1

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I think I have actually found my answer: this particular pen has a separate breather channel going to the underside of the feed instead of a usual arrangement with it being above the ink channels. It seems to be prone to getting clogged with dry ink if you fill it by dipping into the inkwell. So I need to clean it more often than what I'm used to and make sure that there is no excess ink in the breather channel after filling.

Tigozawr
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