Both top and cross slides were cast with integral feed-screw support brackets that gave extra travel by allowing the slides to pass well forward over their ways.
Early Advance with bolt-on headstock, plain bearings and no tumble reverse
Advance screwcutting chart
An early Advance: no tumble reverse, a short apron carrying a full nut, a dog clutch on the leadscrew, changewheels and drive belt unguarded and the tailstock with its vertical end frames and limited barrel reach.