How to refurbish plotter pens?

Mattis Lind mattislind at
Sat Jan 28 08:51:49 CST 2017

I am about to get our IBM1627 (rebranded Calcomp 565) going but the pens in
the case is quite dry. What is the best method to refurbish those? What is
the best solvent to get the old ink out? What ink to refill with?

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