The motor and gearbox in the Jupiter2 have been recently been upgraded to an even heavier duty model that is now fully sealed from the environment within a galvanized rust proof chassis. The zinc plated drive wheel runs on a 1/2ins steel axle that is supported by an oil impregnated Shorelube Brush which is the largest on the market today. The 0-60 second variable time delay PCB now incorporates an optical switching devise which has been chosen specifically for its reliability.