Fitting means tooth dressing and involves swaging, shaping, gauging, and grinding. The swaging is an alternative or supplement to soldering. Equally sturdy presses for all but bullet swaging use often resemble the letter "C". Square and hexagonal wires were possibly made using a swaging technique. A reference manual for bullet swaging is offered by Corbin. It permanently anchors itself to the sheet metal by swaging the surrounding material. Grease is often used to lubricate this swaging process, which is also called roller swaging. Currently there are only a few die makers who manufacture and market bullet swaging equipment. After swaging, any inconsistencies in the metal and rubber have been minimized. During the 1850s swaging tools were developed to provide a more uniform and consistent thread. Swaging ropes with fibre cores is not recommended. Swaging the lead fills the void and eliminates the noise. Swaging is the generic term for setting a lockbolt and collar assembly. Swaging is a method of wire rope termination that refers to the installation technique. Swaging is usually a cold working process, but also may be hot worked.