Ainjest High-Speed Screwcutting Attachment. Detailed Instruction Manual and Spares Parts Manual as Exploded-component drawings. Covers how to operate all models as used on a variety of Colchester, Harrison and other makes of lathe. Both the dial-selector and lever-selector models are covered - though not all styles of body casting are shown - as these vary with the needs of the particular machine to which they were fitted.