bushing
1) metallic tube or lining. without moving parts. to reduce friction between mechanical parts such as a pulley sheave and an axle; also the nonrotating sheave used to increase the bend radius for the sling attachment (contrast with bearing). 2) a device. often made of rubber or plastic. to reduce vibration or wear between mechanical […]
butterfly knot
knot that can be used to form a loop in the standing part of a line.