Gibhead Key : A key (for locating pulleys, etc. on a shaft) having a head formed at right angles to the length of the key at one end which projects above the surface of the shaft to aid removal
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}