Parts › GREEVES CHALLENGER/GRIFFON DRIVE SIDE CRANK NUT G1138 THREAD 5/8 X 20 TPI Image 1 of 3 Image 2 of 3 Image 3 of 3 GREEVES CHALLENGER/GRIFFON DRIVE SIDE CRANK NUT G1138 THREAD 5/8 X 20 TPI £6.25 Crank nut fits 5/8 shaft not some very early engines Quantity: Add To Cart Added! Crank nut fits 5/8 shaft not some very early engines