Hi Everyone, I have been reading this forum for awhile. I can find great reviews here for what I am really grateful. This time however I have an issue I need help with. My 1st ever fountain pen was a Rotring ArtPen EF nib. Recently the cap falls off & due to its "outfit" I cannot use at everyday's work - on the other hand I really-really love its nib (no wonder - I used it 8+ years only! for writing). Could you please support me what is the size of the nib, or with which pens I could exchange the nib? I tried several EF pens to substitute this nib (Pilot, Hero, Parker) but no luck yet - so it would be great if I could use this one. Thank you pszabi