Has anyone tried eye droppering a Kaweco Liquid Ink Cartridge Roller Ball Pen? I'm finding that I generally prefer a fountain pen, but there are times that I want or need a roller ball, be it for carbon copies or those "hey, can I borrow a pen?" moments. Since their Cartridge Roller Balls take the same cartridges as their fountain pens, I don't see any reason eye droppering wouldn't work on them.