I converted this pen to an eyedropper. I filled the tiny holes in the end of the
barrel with super glue. Took a couple of applications. Blow into the barrel to
determine if you have a good seal. Greased up the threads with silicone grease.
No o-ring. Filled with Noodler's Cactus Fruit.
There has been some migration of ink up the threads, but no leaks. Will keep you
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