Mk. 2 Viceroy TDS lathe showing the neat storage for the extra changewheels, an important part of the gearbox screwcutting arrangements, and vital to extend the threading range. The14DP gears were stamped: A = 16t, B = 18t, C = 22t, D = 24t, E = 26t, F = 27t and G = 35t.
In the middle of the gear train can be seen the sliding gear that was used to change between threads and fine feeds and, at 11 o'clock, the spindle locking mechanism. Note the cut-off tumble-reverse lever with its spring indent working against the outside face of the headstock - it was thus locked away safely inside the changewheel guard, away from curious fingers.