Nahvalur Stainless Steel Plastic Feed Silver No.6 Fountain Pen Nib

Compatible models include the Nahvalur Original, Original Plus, Key West, Schuylkill, Nautilus (1st gen Nautilus), Voyage, Horizon, and more. 

How to replace the nib?

Grip the nib on the flat sides with your index finger on top and thumb on the opposite side. Remove by rotating counter-clockwise, insert the replacement nib, and rotate clockwise to tighten.