Bearing, bottom end fixing kit, for Norton twin cylinder engines pre1975 Tighten to 5/16" crankshaft studs or bolts (all pre mk3 twins) 20lbs/ft. Original Part Number: 1 crankshank fixing kit (CSFK); 064185 - long crankshaft stud x2 064184 - short crankshaft stud x4 064160 - 5/16" unf short crankshaft nut x8 064189 - crankshaft nut x4 D12/929; T2032; 067534 - crankshaft tab washer x2