This is the chuck part for the OrenzNero 0.5. The front pipe is fine, and the lead can be extended by knocking, but if the pipe retracts when pressed against paper during writing, preventing you from writing, please purchase this part. "OrenzNero is broken or unusable" 1. Disassemble the front pipe and check if it is clogged (see if the mechanical pencil lead or cleaner pin can pass through). [Clogged] ↳ Replace the front pipe (currently listed). [Not clogged] ↳ Proceed to the next step. 2. With the front pipe removed, insert a new mechanical pencil lead and shake it up and down. [Lead falls out] ↳ Replace the chuck (this product). Please purchase this product. [Lead does not fall out] ↳ Proceed to the next step. 3. With the lead extended a few centimeters from the chuck, gently push the lead towards the eraser. [Retracted, inserted] ↳ Replace the chuck (this product). Please purchase this product. [Lead broke, did not insert] ↳ Please try step 2 again. I also sell front pipes (nibs), so please check them out. Other lead diameters are also available. Nohara Kogei Kobo Tsutsumi Craft A Drafting Mechanical Pencil Staedtler Reg United Bees Luddite Pencil Case Lupo Pencil Case Debu Pencil Case Romeo LAMY Lamy Scribble Discontinued Mechanical Pencil Ace Selling Fountain Pen Parker Limited Color Kaweco Special Pencil Kaweco Blue Edition OrenzNero Orenz Graph 1000cs Aluminum & Rhodia Script Lamy Safari Nomad Carbonium Pencil Case Graph Gear 1000 Kinokuniya Limited Apita Limited Aeon Limited Tsutaya Limited TSUTAYA Limited Lupo 2 Pencil Case Smash Loph Smash Pro Use Energel Acro Ink Acro Drive S20 0.3 S20 Legno Pilot Pentel Tom Lumio Lead Holder Auto Brass Lead Hacoa Ruler Hacoa + Number Kaweco Brass Graph 1000 for pro OrenzNero 0.5 Kuru Toga Advance Kuru Toga DelGuard Tradio Signo Rotring 800 Rotring 600 Rotring 500 Rotring 300 Rotring 600