The Underdrive model had the countershaft contained within the stand. The pulleys were overhung from each side of bearings held within a plumber block.
The upper assembly contained two sealed-for-life ball races and the lower an oil-impregnated bronze bush.

The robust Timken tapered roller bearing headstock spindle from the Underdrive model with its 60 hole division ring and twin V-belt drive.

In 1967 a minor change was made to the apron-mounted mechanism that engaged the (standard-fit) power cross feed with the provision of a simple, ball-ended toggle arm to slide the selector button in and out.