HARRISON Lathes Models 12-inch and 13-inch swing L6 Mk. 3 - also badged as the 155 and 165 and distinguishable from earlier models by a flat front face to the headstock a long, single upward pointing handle on the face and two spindle-speed change levers on the top, a third control shaft control rod below the leadscrew and power-feeds shaft, a screwcutting gearbox with a sliding selector control that indexed into a row of holes. The gearbox had either two thumb lever along the top edge (English threading) or three thumb levers (metric version).