I'd like to share a question about disassembling the piston mechanism on Pelikan 400NN Merz&Krell. I got one today, literally covered in dirt and dust. After few hours of soaking in lukewarm distilled water, I could easily take apart the nib assembly, the collar, the feed, clean and re-set the nib, put everything back together, ink it and write test it. To my surprise, I found it to be in mint condition, perhaps used once and set aside, than forgotten for 40 years.
The only thing I was afraid to mess with was taking apart the piston assembly. It isn't a matter of whether I really needed it, I prefer learning how to do it. I understand it is right-threaded (=normal-threaded), but I see no clue for unscrewing it.
Is there someone who could give me detailed instructions on how to do it?
Should I turn it past the point of having pushed the piston all the way down? I see no dried ink traces on the "wrong side of the piston". These pens are rather scarce, so I haven't done this before and I am afraid of applying force which could break the differential system on this beautiful pen. Any expert hint will be more than welcome.
Thanks in advance!
Edited by stoen, 28 February 2020 - 11:25.