As some of you know, I am a user of fountain pens. There are all sorts of fill mechanisms for fountain pens such as levers, pistons, converters, and cartridges. My usual method is to refill cartridges from bottled ink using a syringe.
From time to time, questions come up about how to refill cartridges so I decided to make a short video of the easy procedure.
I hope this was helpful. Please comment below if you have any questions.