presently preferred embodiment the edges 72 and 74 on opposite sides of the outer ring 38 are each formed with a taper this allows a milling machine not shown to form a convex curvature on the exposed surface 76 of the insert 40 without interference from the outer ring 38 see fig2 the first and second plates 34 36 and the outer ring 38 are preferably formed of hot rolled steel or other suitable material the dimensions of these elements 34 36 and 38 are chosen to provide a safety factor of 8 or more considering the weight of currently commercially available backhoe loaders 10 the insert 40 is preferably a heavy duty conveyor belt of the type used in mining operations or similar belt like constructions which exhibit limited compression under load the method of this invention may be described with reference to fig3 6 the backhoe loader 10 is initially depicted in a position with its rear stabilizer arms 20 extended but off of the ground 76 see fig3 the front loader 12 and stabilizer arms 20 are then both extended as shown in fig4 so that the frame 18 front wheels 22 and rear wheels 24 are lifted off of the ground for purposes of the present discussion.