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Fountain pen converter sizes and lookup chart
The top graphic is a link to one page that lists converters by size This one includes dimensions and capacities. The next is a guide by pen brand.
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J.S. Staedtler MARS no. 4290
This is a J.S. Staedtler MARS no. 4290 chased piston filler that needed a new cork gasket. I made a new one using the same procedure as I used on this pen....