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Ok, more sciencing on my Kaweco Art Sports. New 🧵 #FountainPen

Recap: the art sports, and the first version of the piston filler, with the clip permanently mounted, lack the inner cap other Kaweco Sports have, and doesn't seal well, resulting in pens that dry out very quickly.

I have three pens.
One is unmodified, one has gotten a silicone o-ring inside the cap to create a seal between the pen body and the cap, and one has gotten plumber's tape between the finial and the cap.

1/?