TWSBI Diamond 580 Replacement Nib UnitReplacement nib unit for the TWSBI 580 range of fountain pens including pens with coloured grips. This is a genuine replacement nib, made in Germany from high quality stainless steel. Supplied as a nib unit assembly(nib feed on a holder) including the stainless steel collar and a clear grip section. The 580 nib unit assembly is easy to fit and can be done while the pen is inked: Unscrew the original nib and grip section from the barrel Screw on the
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