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Ugly Pens: Rotring Core
(lemmy.world)
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Don't use lacquer thinner. That will attack any plastic or rubber parts in the pen.
However, various alcohols can eventually dissolve shellac, including denatured (methyl) and Everclear (ethanol).
After soaking it in very hot water last night I got the bright idea to try to scrape it with a little wooden coffee stirrer. I broke the rubber gasket that goes around the post on the receiving end. So I think that tip is done. I bought a replacement tip last night for $10.