I have a beautiful black Esterbrook Safari pen I thought I'd try for something different. Has anyone tried one of these? This one came with an old Esterbrook empty cartridge. I cleaned out the cartridge thoroughly and rinsed out the section and nib very well. The issue I'm having is that it flows terrible. I can write a sentence then tap-tap-tap to start it again. Write another sentence or two then tap-tap-tap to get it going again. Even after several pages it doesn't improve any. Any ideas on what else to do?