a collet attachment apparatus for a lathe machine tool including a collet holder for engagement of a spring collet , a nose collet adapter chuck to be fastened to a standard master chuck for engagement of a collet holder . a rear spindle draw tube adapter fastens to a hydraulic actuator to cause axial movement of a drawbar and exert or release pressure on the spring collet . various lock ring means are utilized to limit the axial movement of the drawbar and ultimately the pressure on the collet .