It seems this tube should hit the cartridge squarely in the center and being off to one side as it is, it does not allow the cartridge to seat properly in the section and is allowing an air leak and thus ink to leak. I have never used the converter but it might allow a better "fit" inside the section and solve the leaking though I still think the problem is real and should be fixed.
Question #1 is: can that thing (feeder tube?) insde the section be carefully bent to a more centered position?
Another problem is I think this leaking ink has caused the gold trim near the nib to corrode and most has come off the end of the section. It is cometic of course but perhaps I have had a defective FP all along. Any chance Waterman would replace the section? [I have already seen some leads on this forum where some users have parts I need to replace the section.]
Thanks for reading ... and any guidance anyone can give.