of tube 22 and extends loosely through the center of plate 18 thus plate 18 is rotatable relative to tube 20 about pin 50 with the edge support of brackets 44 and 48 this pivotability facilitates vertical drilling even where crane 10 is not on level ground since the tubes automatically assume a vertical orientation under the force of gravity acting on the weight of tubes frames etc depending therefrom plate 18 is mounted on boom point 12 by means of a pair of bars 54 as seen in fig2 5 and 6 which are secured to plate 18 such as by welding a u shaped slot 56 in the end of each bar 54 is sized to fit over the extended ends of axle 58 in boom point 12 filler blocks 60 are inserted after slots 56 are moved over axles 58 and are held in place by bolts 62 as seen in fig4 6 this suspended drill system is mounted on crane by laying the tube assembly horizontally on the ground with plate 18 horizontal and bars 54 pointing upwardly boom point 12 is lowered until axle ends 58 enter slots 56 blocks 60 are inserted into slots 56 and bolts 62 are installed boom 16 is then raised slowly lifting plate 18 and allowing tubes 20 22 and 23 to swing to a vertical position since plate 18 can pivot about axle 58 in one plane and about pin 50 in the perpendicular plance tubes 22 and 23 will always automatically assume a vertical position for drilling boom 16 is moved to locate drill stem 26 over the desired drilling.