You would need to knock/push the piston assembly out of the barrel (using a wooden dovel or a small rod for example). It is friction fit and should come out with a little justly applied force. That said, do not try to pull it out unless it is already half way out or something like that.
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Few things that might make it a little easier:
- soaking the barrel thoroughly (to make sure there is no dried ink clogging things up) and...
- using some heat to make things a bit more loose. Like immerse the pen in some warm water for a bit (as hot as your hand can handle but not hotter is a good guideline) prior to trying to push the piston assembly out.
Other things to watch out for?
- use a dovel/rod that is smaller diameter than the inner diameter of the section throughout, you do not want to have the dovel wedging in and splitting the section and the barrel apart.
- only push straight, any forces that twist or cause torsion on the barrel or the section are a bad thing TM. Also, slow is smooth and smooth is fast.
- make sure the end of the dovel is flat, it is pushing against the piston seal, you do not want to damage that in the process.
There are instructional materials on the webbyweb so just google "Pelikan 400 piston disassembly". The process is the same for Pelikan pens like 140, 400N and 400NN.
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