Tapered sockets are developed for swift assembly and disassembly of pulleys and other transmission equipment with out the need to have for specific instruments other than a hex key. A variety of machined holes make certain fast group, avoiding high priced manufacturing unit downtime. Bushings are keyways machined to British Standard Requirements. This is in addition to the clamping screw, which is enough for the essential torque in a lot of circumstances. Tightening with a tapered bushing removes any hole among the hub and the bore, which eliminates fretting corrosion.