For sale is a K.O. Lee Model B943 Motorized Work-Head for use with Tool and Cutter Grinders, etc. Unit Serial No.10277. Swivel base. 1-3/8" Diameter spindle through-hole (measured at butt end of spindle). 2-Step cone pulley for speed changes. Forward/Off/Reverse switch. NOTE: I have tested this motorized work-head; it runs very smoothly, and the rotation switch also works correctly. This is a nice sounding machine tool attachment!