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I know that the easiest thing would be to get a new converter, but am curious about what exactly is wrong with it and if there's an easy fix, as I'm a tinkerer. The symptoms: A international piston converter with no apparent cracks fills up when attached to a pen section nipple but quickly loses ink, which flows back out through the nib. If the converter is not attached to the nipple and on its own outside the pen, this doesn't happen and the ink stays inside. Tried with several pens and the symptoms stay constant, so it's not a pen-specific issue. What's the probable diagnosis?

Hello there I just acquired my first Montblanc fountain pen, but it's very old and has a lot of problems. There is no text on it - only "MONT BLANC" written on the cap and the clip, so I've had troubles identifying it myself. If anyone has an idea what pen this might be, please tell me. The nib says: WARRANTED 14 CT CSMI IRIDIUM First of all, I haven't been able to fill it. The top has an etched line which I suspected screwed of to reveal a button, but with a closer inspections, I've concluded it's not a seperate part. I'm now pretty sure that it screws at the section, but I've tried everything, and it's just stuck. Can anyone confirm this? I've tried to dip it ink and write with a little bit anyways. The nib is in a really bad shape, and is the most scratchy I've ever tried. It's placed asymmetrically on the feed, so I'm guessing the nib can be changed? What standard would that be? Look at the photos, and I would be glad to get some answers to my questions.