Penexchange

I found the solution myself! I removed the pen section, filled the pen with cold water and sealed the hole. Then I heated the pen with a fan and after a while I pushed the piston button inside. It went in smoothly. The cold water caused only the barrel to expand, and that was the trick.
Thank you!

Hey, everybody, This is my Pelican 140. Everything is fine except for that small gap you can see in the photo between the barrel and the piston knob. They don't fit together. It looks pretty unsightly, I'd like to fix it. But I don't know how to do it. Is there a way? Or is it better to leave it as ...