the length of the tower 12 if the tower is similar to apparatus described in our united states patent application ser no 030 221 filed apr 16 1977 entitled 34 rectilinear positioning device for drilling pod 34 then the pod 10 can actually be raised above the top of the tower 12 in that application a drill steel guide mounted on top of a track that rises within the tower is described a drawback of that arrangement is that the overall height of the tower is increased by the space taken up by the drill guide this in turn restricts the height to which the drill pod may be raised also shown in fig1 is the horizontal track 13 on which the vertical tower is carried the drill steel 14 is shown extending upward from the drill pod the location of a drill guide 15 as disclosed herein is shown in the drill steel embracing and supporting position the drill pod 10 39 in a raised position is shown with phantom lines and the drill guide 15 39 in the 34 kicked out 34 position is also shown in phantom lines referring now to fig4 and 5 the shaft anchor 20 comprises a base 21 which can be secured to the towerwall 12 and a tubular shaft boss 22 mounted to the base 21 the axis of the tubular shaft boss 22 lies generally speaking in a plane parallel to the horizontal when the base 21 is attached to the tower 12 the axis of the shaft boss 22 forms a small angle u03b1.