Hi, i got my fingers on a 1934 Kaweco Colleg with a beatifull 14c F-Nib with the right amount of flex in daily writing, just the cork gasket is broken, so the whole ink leaves the pen on the wrong end I allready tried to open it, continue screwing the piston back/out, tried screwing the "extra" part at the end... tried to "soak" it in water, even with a rubber/leather band and a pliers.. Nothing moved out... and i fear if i use more violence it breaks so anyone know how to open this little guy? It's an Kaweco Colleg 55 09 from 1934(?) Picture of it is attached.. greets Mike