12 Apparatus for power transmission for land vehicles, namely, clutch mechanisms for land vehicles, clutch assemblies, clutch cover assemblies, clutch covers, clutch pressure springs, clutch levers, clutch sleeves, clutch sleeve springs, clutch adjusters, clutch disc retainer plates, clutch pressure plates, clutch front cover gaskets, clutch shift power gaskets, bell housing gaskets, clutch friction disc assemblies, clutch buttons, clutch bushings, clutch thrust washers, clutch center plates, clutch intermediate plates, clutch input shafts, clutch pilot bearing assemblies, clutch fiber spacers, clutch release bearing assemblies, clutch release yokes, clutch brakes, clutch torque brakes, and clutch flywheel assemblies, clutch flywheels