after the second world war, norton reverted to civilian motorcycle production, gradually increasing its range. a major addition in 1949 was the twin cylinder model 7, known as the norton dominator, a pushrod 500 cc twin-cylinder machine designed by bert hopwood. its chassis was derived from the es2 single, with telescopic front and plunger rear suspension, and an updated version of the gearbox known as the "lay-down" box. more shapely mudguards and tanks completed the more modern styling to nortons new premium model twin.