A section through the headstock showing the sliding spindle, outboard drive pulley and bearing layout.
On the non-gearbox model, with the changewheels disengaged, the fine feed was arranged through a belt drive to a two-speed gearbox on the end of the leadscrew.
Lathe set with changewheels for screwcutting and showing the outboard headstock drive and jockey pulleys.
Later versions (this is an M300 Series) had an altered drive line ...