Mast tip weight measured in following fashion. One end of mast placed on a solid object. Other end of mast hung from a set of scales (eg fish scales). Mast is horizontal at the time.



Most carbon masts would require up to 500gm to equalise to an Aluminium mast if lead placed at the tip of the mast.



The Tornado class uses the tip weight rule and some of their masts have anything up to a kilogram.