Disassembly Jig for Platinum Pocket Fountain Pen (Short Body) This is a disassembly jig for those who want to remove the nib from the pen and perform maintenance such as removing ink residue. It is made of pipe molding material, but it has sufficient strength and durability. You don't use it very often, and there's no need to buy an expensive one of the same type. When ink is stuck inside the neck, wash it thoroughly before disassembling.