Original Norton spares manufacturer and supplier Andover Norton Ltd. now has complete gearboxes for Norton 750 and 850 Commandos. Unavailable since Norton went out of business in the late 1970s, these replacement gearboxes are made using the original drawings and incorporate modern materials as required. Three units are available; one with a low second gear for early units up to serial number 306590, one with a higher second gear, and gearboxes for electric-start MkIIIs. $2,650 (approx.).