This ink converter has a screw type mechanism for drawing up ink into the pen chamber. Fit one of these and you won’t have to buy and throw away any more plastic ink cartridges.
(Pen not included - purchase separately)
Instructions: fit ink converter to fountain pen (pushes in like a cartridge). Wind down the screw mechanism, then put the nib into the ink bottle. Wind the screw mechanism up again - and it fills the camber with ink. Back off the screw a bit to see a couple of drops come out to make sure all is OK. Wipe off any excess ink. You're now ready to go!
You can see a YouTube video of how this works HERE