Sheaffer Piston Converter Here are the known Sheaffer converters, Service& Repair@bicworld, I can't answer for the Cross, but Sheaffer ONLY takes Sheaffer carts and convs, Sheaffer is an American maker of fountain, ballpoint, and rollerball pens, This replacement Sheaffer converter will fit in most Sheaffer fountain pens (except the VFM), allowing you to easily use bottled ink instead of ink cartridges, Otherwise, you'll be fine, Seemed to work a treat, but I think I might h The Sheaffer piston converter fits most current Sheaffer pens that take standard Sheaffer Skrip cartridges, Compatible with Prelude, Sagaris, Intensity, 300, and 100 fountain pens, FEATURES Twist mechanism Compatible with most Sheaffer fountain pens Turn counter clockwise until the piston is depressed to the bottom MATERIALS Resin SPECS Diameter: 8 mm Length: 68 mm COUNTRY OF The Sheaffer fountain pen piston converter is a screw-action piston converter to allow the use of bottled ink with most classic Sheaffer fountain pen ink cartridges, Their fountain pens take a standard international ink cartridge, a proprietary size cartridge, or a piston converter, ldvzygmetvartscijckwsqjgxtlrzkhuqcudwabeppw