 The slimline was used until the last of the vertical twin cylinder models in the late 1960s, the Norton Mercury, a limited-production run of single carburettor 650 cc machines based on the Dominator; the Norton Commando with its new frame design and angled-forward engine having been launched at the Earls Court show in 1967 took over as the 750 cc range-topper, later enlarged to 830 cc, but badged as '850'.Dave Degens created his first hybrid motorcycle of a Triumph engine/Norton rolling chassis in 1961 when working for former racer and motorcycle race shop owner Geoff Monty, using a racing Manx Norton with a blown engine.The bike was sold before it was finished, and realising there was a potential business, in 1963 Degens bought into "Dresda Autos", a small scooter shop in South London together with business partner Richard 'Dickie' Boon, keeping the existing name.