notches 88 alternatively a plurality of grooves not shown extends axially along the entire length of the interior surface of the tubular member 80 the tubular member 60 of the upper shaft guide 58 extends to the inner surface of the tubular member 80 of the sleeve shaft guide 78 an outer surface of the tubular member 60 preferably includes a plurality of notches formed therefrom for each receiving a locking ball 90 for cooperating with the grooves and the locking notches 88 of the tubular member 88 an outer surface of the pedestal member 82 includes a plurality of generally cylindrical bores not shown formed therefrom each bore receives a preferably helical locking spring 92 for biasing a spherical locking ball 94 the locking balls 94 cooperate with the grooves 32 and locking notches 34 of the upper telescoping member 28 a preferably helical first compression spring 96 is attached at a lower end to the weld washer 102 and at an upper end to a lower surface of the pedestal member 48 of the intermediate shaft guide 44 a preferably helical second compression spring 98 is attached at a lower end to an upper surface of the pedestal member 48 of the intermediate shaft guide 44 and at an upper end to a lower surface of the base member 62 of the upper shaft guide 58 the coils of the second spring 98 are preferably wound around.