High Voltage
In the top 97% of Urban's most interesting posters
You can get a squeeze convertor for the Capless which holds considerably more ink than the little screw one - I also find that the screw ones are impossible to fill completely. (Or, there are always cartridges, but not in very exciting colours.)
Can you actually "see" ink showing in the window on the screw converter - only on mine, the clear window remains, that, CLEAR - so either I'm doing something wrong or it's not sucking up ink. Which would explain why I have to fill the pen on a very regular basis