Make sure it is secure in the pen otherwise a seal may not be created causing the pen to leak.

I'm going to try "breaking" the seal that connects to see if it'll flow properly

All boxes arrived and cartridge seals were broken

However, when it came, 8/10 of the ink cartridges had the sealing broken (and slight leakage)

All cartridges dried out before I could use them because the seals were broken and leaking

Maybe consider better seals that can better handle shipping.

Arrived OK!They work as