
TWSBI Diamond 580 Rose Gold Replacement Nib (Nib Only) - 1.1mm Italic (stub) nib
To replace your Diamond 580 nib, unscrew the original nib unit from the pen. If you are only replacing the metal nib part, slide the old nib out and slide the new in, taking care not to damage the fins on the feed. If you are replacing the nib and feed, take the old grip and collar off the original nib unit and slide these parts onto the new before screwing the new unit onto the pen.