Hit my first fountain pen today that was so clogged I had to use the ultrasonic cleaner. Hero 1086, had Diamine Ancient Copper in it, but it dried out. Nothing would flow through the feed even after soaking for a couple hours and trying a bulb syringe. After 90 sec in the ultrasonic cleaner I could get some water through, two more rounds got it flowing freely so I could flush it the rest of the way. I'll have to keep a closer eye on that one.
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