Vintage KDK Series O Quick Change Lathe Tool Post. Original KDK Series O quick change lathe tool post manufactured by L. (Jack) Kuhn of South Gate, California. This is a genuine American-made KDK tool post designed for use on lathes in the approximately 8″-12″ swing range. The tool post has been cleaned and inspected. It shows normal cosmetic wear, surface oxidation, scratches, and age-related marks consistent with decades of shop use. The original KDK identification plate remains attached and legible. KDK Series O Tool Post. Lever assembly as shown. Surface wear from normal use. Please review all photographs carefully for cosmetic condition and compatibility.