I have a Yiren 566 and it is leaking ink. If left nib downwards for any length of time there is ink in the cap. Are any of the other Lamy clones affected in the same way? This is the third Yiren 566 and all three have had the same issue. The pen is inked with Hero 234 Carbon Black using it's own converter. This ink is somewhat thicker than normal. In the past I have lost a converter of Herbin Lie de The and a Parker cartridge. There has to be air getting in for there to be the slow flow of ink out or else there'd be a vacuum which would stop it. On the present pen I have not tried a Parker cartridge that had ink in, but I do have a converter for my Parker Reflex. That felt somewhat loose, I was therefore unwilling to sacrifice a filled cartridge for research purposes. What would you do? Strip the pen & re-assemble with some sort of sealant? I thought the Yiren 566 was a reasonable Safari knock-off.