of the end portions of a vertical guide outer member 23 by means of a pin p which pin p is disposed through both forks of the yoke 20 and through the vertical guide outer member 23 so as to enable the vertical guide outer member 23 to move in a swinging motion whose general direction is indicated by the arrow in fig1 which is disposed about the pin p the vertical guide outer member 23 is of hollow tubular construction and its end portion which is not connected to the two axis hinge 19 is an open end which is adapted to receive a first end portion of vertical guide inner member 25 in a sliding arrangement the other second end of the vertical guide inner member 25 is attached to the drilling head which is described in greater detail below also attached to the two axis hinge 19 by means of a bracket 21 is the end portion of the stationary section 27 of a hydraulic ram which hydraulic ram hangs vertically and in substantial parallel orientation with respect to the vertical guide outer member 23 and vertical guide inner member 25 when the device 10 of the invention is in use the hydraulic ram has a moveable portion 85 whose free end is attached to the drilling head which is also described in greater detail below the drilling head includes a hydraulic motor 43 which is powered by hydraulic fluid caused to be under pressure from the operation of the engine.