I am in need of finding a high-capacity ink converter to use in making a bespoke fountain pen for a customer that does Copperplate Script calligraphy and uses an abundance of ink. She is will to consider me making an Eye Dropper one yet more messy and my concern of the grease and possible O-ring I have researched will eliminate leakage concerns. The nib she acquired is a flex 14k Jowo#6 and between purchase and modifications on the nib is around $200. So shoot me some ideas please.