Will Any Converter Work On A Speedball Calligraphy Fountain Pen?

[KateGladstone]

Will any converter work on a Speedball Calligraphy Fountain Pen? Ive been using them for everyday writing, and I would like to be able to use them with bottled ink (although the Speedball cartridges are excellent).

[BaronWulfraed]

Based upon photos, it uses international standard cartridges.

 

The trick now -- will the pen take two cartridges at a time, back-to-back

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If it will, a common converter for international standard should fit. If it won't take two cartridges, the odds go down -- maybe the twist shaft will fit into whatever is stopping the second cartridge.