against flat sides 30 of the shaft and restrict any play of the handle relative to the shaft except in the plane of the handle about the pivot bolt 28 preferably this pivot bolt 28 is tightened to form a stiff pivot means so the handle cannot pivot of its own weight but may pivot at will through a small angle when moved by the user at the upper portion of the handle 14 there is a hand grip member 34 that is pivotally connected to the handle by means of a mounting plate 36 and a pivot bolt 38 this bolt 38 is also tightened to form a stiff pivot means such that the hand grip 34 will not pivot of its own weight but may pivot at will through a small angle when moved by the user the mounting plate 36 has a downturned flange 40 at each end to receive a pivot pin 42 the hand grip 34 includes a bar 44 of u shape having a mid portion 46 and parallel end portions 48 48 these end portions 48 48 are fastened to the mounting plate 36 by means of the pivot pins 42 42 with this arrangement the pivotal axis of the pivot bolt 38 and the pivotal axis of the two in line pivot pins 42 are perpendicular to each other and thus together form a universal connection between the hand grip 34 and the handle 14 the mid portion 46 of the bar 44 of the hand grip 34 is preferably furnished with a loose elongated roller 50 for engagement by the user 39 s clenched fist adjustment holes 52 may be.