Cone part is Dural' machined from billet..Was originaly 12 swg Dural' spinning..The pulleys are carried on a High Tensile steel ( S96 ) spindle . The threaded portion passes through a hole in the top (truncated cone ) face , up to the shoulder...which is "snugged " to the cone with a short pin ....The whole being secured by a 1/2"BSF nut and through pin....This is a "Double" pulley arrangement ......See later photo's for instalation.
