Vintage Piston Filler - Stiff Piston

[butangmucat]

Hello,

 

I have got two Pelikan Go pistion fillers, one NOS and one used. The NOS one was filled with Noodler's Polar Blue for about three weeks and forgot to clean it. Today I changed it to Polar Black. When I was cleaning the pen I found that its piston was not buttery smooth (which my other Go and my TWSBIS are) and needs some little effort to operate the piston. I searched the forum and most suggestions involved using silicon oil (I have some from my TWSBI) but according to S Bre Brown, this pen cannot be taken apart for service. I cannot remember if this pen was buttery smooth and why I was using a lubracating ink. Will this demage the pen and will libracating ink work? What should I take care of in the future?

[butangmucat]

Maybe I need to try https://www.fountainpennetwork.com/forum/topic/298760-taking-apart-a-pelikan-m75-go/