Special tools for disassembling Montblanc 146 and 149 fountain pens. Also usable for Visconti fountain pens. This single tool allows for the disassembly of the nib unit and piston (blind cap). Please use it for repairs, disassembly, cleaning, etc. Please confirm compatibility before purchasing, as Montblanc fountain pens have different shapes depending on the manufacturing year. Compatibility: - Compatible with nib units that have notches on the left and right sides of the nib. (Not compatible with types that have notches on the top and bottom of the nib.) Please refer to the images for details. - Piston disassembly is likely possible for all years of 146 and 149 models. We have a large stock, so please contact us if you would like to purchase multiple items. Even if this page shows as sold out, we may still have stock. Please comment on any of our products, and we will create a dedicated listing for you. Returns are not accepted due to reasons such as incompatibility. Please confirm compatibility before purchasing. Questions are welcome. Disassembly is at your own risk.