Abstract: Structure for and method of mounting and actuating a spring loaded drawbar actuated boring and grooving tool on a spindle which spindle includes a machine tool hydraulically actuated drawbar therein, wherein there is no positive connection between the spring loaded boring and grooving tool drawbar and the machine tool drawbar, facilitating angular alignment of the boring and grooving tool and spindle with the boring and grooving tool in surface to surface contact with the spindle. The spring loaded drawbar is resiliently urged toward the machine tool hydraulically actuated drawbar to actuate grooving bits on the boring and grooving tool.Leakage of air under pressure between the drawbars is sensed as an indication of a worn or broken grooving tool.Guiding and assuring concentricity of the grooving bits is accomplished from the outer end of the boring and grooving tool by rectangular boring bits secured in angularly spaced apart relation around the outer periphery of an end cap.