Gregory's Serversecure the Allen wrench in a small vise around 2-3mm from the pen. then give the ring around the pen a push, and the cap pops right off!
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 put the fiber tip back in by just holding it with a Kim wipe and pushing it gently back in place. these are pretty dried out so i am soaking the entire plastic pen and fiber tip (with the reservoir removed) in water. we'll see if that works. @tubetime great stuff. I have two HP plotters and many dried out pens, I’ll try the technique: https://mastodon.sdf.org/@davbucci/111631510249153445  Another idea; Isn't the tip soft enough to poke a syringe through it? If so, it should be less messy and probably allow for more refill cycles. Just an idea. ok next step is to take apart a fine tip sharpie and remove the internal ink reservoir. then cut a short length off. take that little stub of a new ink reservoir and jam it into the cleaned pen, and then snap the cap back in place. i've found that it actually helped if i didn't clean the fiber tip too thoroughly. just enough to loosen up the existing ink. i suppose you'll need to clean it out completely if you're changing the color or whatever.  @jhaluska it's not that bad, i wore one glove and only got one drop of ink on my fingers. @tubetime Maybe when you do it, if I were to try this it would look like somebody attempted to kill me with a sharpie. |
then you can fish out the ink reservoir with a dental pick or something.