The Acme Studio fountain pen conversion kit, will also convert any ACME roller ball, to a fountain pen.
Acme Studio fountain pen conversion kit
Convert your ACME roller ball into a fountain pen!. The kit replaces the roller ball front end of your pen so you can use bottled ink or international fountain pen cartridges
The conversion kit comes with a High quality German steel and iridium tip nib with a medium width. A Converter for bottled ink feed, comes included. The Converter kit, will also accept standard (international) sized ink cartridges, if desired.