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Does anyone know what type of ink cartridge corresponds to a description of “2.6mm inner diameter” ink cartridge? On eBay, as a gift to my daughter-in-law, I purchased a new Taylor Swift Tortured Poets Department (TPD) fountain pen. It came with a single cartridge and no documentation of the type of cartridge to be used. I asked my eBay seller, who asked TPD customer service, which provided the “2.6mm inner diameter” information. Frustrating. Just to experiment, I used my own Diamine short cartridge, which is an International Standard type cartridge. It fits, but the portion that goes into the barrel, although it fits into the section, fits snugly, and I’m concerned that in warm conditions it might detach when unscrewing the barrel from the section. It took a good amount of time for the pen to write. The cartridge that came with the pen has an overall slimmer and longer profile, although not as long as, say a Levenger long cartridge that has two different puncture ends. I am unable to fit an International Standard converter into the pen. In any case, it appears that any standard size converter is too long for the pen. Help!