The parallel pen cartridge just fits into the top of the section avoiding leakage problems (the back of the nib block is also hollowed out). The capacity being higher in ml and the inner diameter being wider, the ink flow is enriched, allowing substantial fills, the fineness being ensured, as with all flexible nibs, by the finesse of this one. Of course it must be filled with the syringe, the dropper, but I prefer the perfume pipette, smaller and which fits in all converters.
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