Koh-I-Noor Rapidograph True Fountain Pen

[Scribblesoften]

Can you show us a photo of the front of the pen where the "nib" section goes into the pen? I use the usual Koh-I-Noor rapidographs with the osmiroid short italic nibs. The nibs fit within the cap and these are nicely functioning piston fillers. As noted above, one must remove the inner cap.

[Alex Howard]

There is a difference in cap construction amongst the Kohinoor Rapidographs themselves, and a difference from the Kohinoors in the cap construction of the Rotring Rapidographs. Esterbrook and Venus nibs can work in the Kohinoors. Haven't tried them in the Rotrings. Not all Kohinoor pens are suited to the adaptation. It depends on whether the inner cap can be removed (or reduced by means of cutting--which I've never wanted to try).