Left: a double row of spindle-indexing holes drilled into the flange surrounding the largest headstock pulley on a Stark No. 31/2 lathe.
At the rear of the headstock front bearing is a lever which engages a pin in one of four holes in the front face of the smallest pulley.









Below: one of the 4 holes in the face of the smallest headstock pulley.

With the model number often cast into the bed identification of many Stark lathes is foolproof.
The elliptical bed foot was a distinctive Stark "trade