Kosca Fountain Pen Repair

[daynix]

Help!! I'm trying to restore this very nice Kosca piston filler. I can't get the piston out to replace the cork. I've talked to a couple of my pen friends who suggested I remove the tail cover and hopefully discover a pin - unfortunately no pin. I've been very careful, taking my time to not destroy the pen in the repair proces, so finally got the cover off this morning. I'm open to suggestions. Its a beautiful pen, just can't figure out the repair. (the tail end looks ugly, but that's how it appeared after I removed the cover.The groove fits a piece inside the removed cover)

[roberto v]

In my opinion, the pin still is the most probabile solution. I'd try to remove all the glue remains on the bid cap and check again, especially (but not only) in the grooves.

 

Another possibility can be a screw on the top of the turning knob (less likely).

 

Have you tried to unscrew completely the turning knob and see if the piston comes out from the front? You might extract it, lathe a new cork and reinstall it if it's soft enough

 

Just my 2 cents