A stand similar in size and construction to the belt-driven underdrive stand this version was fitted with the "Speed Box" used on the cast-iron and open-frame stands. The drive system involved the use of a beautifully built two-speed gearbox held within the cabinet and driven by a single V-belt from a motor carried on a hinged  plate behind it. The gearbox contained upper and lower shafts, each carrying pairs of helical-cut gears, of different ratio and arranged so that the two shafts were connected by the gears in constant mesh.  Either pair of gears could be selected through a two-way, multiple steel-disc clutch operated by a hand lever moving through a lateral quadrant (marked Rivett in the picture). The unit incorporated an automatic brake, activated when the lever was moved to its spring-loaded central position. The gearbox, in which all moving parts were dynamically balanced, was fitted with heat-treated alloy steel shafts running on roller bearings. At the headstock end of the stand a cut-out was arranged that allowed an endless belt to be fitted without any dismantling..