How do I prevent my Conid Bulkfiller from leaking when I take it with me on an airplane?

Maintenance/using my Bulkfiller

How do I prevent my Conid Bulkfiller from leaking when I take it with me on an airplane?

Before takeoff, hold pen vertical with nib up.
Then, open the hand nut a little (3, 4mm) which allows the ink in the front chamber to flow back to the main resevoir.
Stimulate the flow by GENTLY ticking the side of the pen.
Finally, close the hand nut again while still holding the pen vertical.
Your Bulkfiller is now flight-ready. Be aware that the feeder still holds a little bit of ink, so uncap the pen after the flight with a little caution…