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Thank you for your advice on Southern Scribe. To answer your question though, if you look at the picture or You Tube video please notice that towards the front of the pen, an inch above the nib section there is a thin silver band with the word Montegrappa etched into it. It lays exactly under the writer's finger as he holds the pen while writing. This is exactly where the ink leaks from. As I try to fill the pen or discharge ink, ink leaks freely around this juncture. As you pointed out it must be a threaded connection. I have not attempted to unscrew it. Was wondering if immersing it in hot water for a few minutes may help?
Unfortunately it is not under warranty. It was released back in 2009.
I recently purchased a brand new out of the box limited edition Montegrappa Luxor Blue Nile fountain pen. The second time it was filled the ink started leaking from the forward connection of the body of the pen and the front section that holds the nib. At this juncture, there is a silver band which gives the impression that this is a removable front section. Not sure if it is screwed in and may thus require silicone. As you know this is a piston filling mechanism. Any input would be greatly appreciated as this is a splendid highly coveted and rather expensive pen.