Just received an Esterbrook cartridge pen (without cartridge ). I'd checked its photos on eBay and it looked as if the nib was missing; just the feed left screwed into the section. Still, the price was good and I have spare nibs so I bagged it. What I received was the pen with a used fibre tip 'nib' which screws into the section just like any other Estie nib. I have an unused tip of this kind in a box which told me it's a Wonderiter [sic - sorry for error in title] flo-tip. I'm soaking the old ink out of the tip at the moment and had an initial writing test with the revived dried stuff, an