at least two engagement recesses 108 are disposed through the element 106 the clamping member 48 of this embodiment is positioned longitudinally relative to the platform member not shown in the direction shown by arrow 110 such that the two engagement recesses 108 overlap two similarly spaced apart engagement recesses 112 disposed through the support arm 94 a bolted connection utilizing a knurl knob bolt 114 is projected through each of the overlapped recesses 108 112 the bolt end captured by a securing nut not shown affixed to an inner surface of the support arm 94 alternatively the support arm recesses 112 may be tapped such that the bolts 114 may be securely engaged therein a protective u shaped sheath 116 is shown installed along the concave side of the clamping portion 48 in the manner previously described to protect the tree from the teeth 51 shown in fig1 according to any of the three embodiments described above and shown in fig2 5 11 12 the support arm 40 94 is pivotable about the bolted connection 44 through the upturned edge 32 of the platform portion 22 the support arm 40 94 is pivoted to a desired angle such as 30 degrees from the plane of the platform portion 22 to establish the necessary structural and geometrical relationship of the support arm 40 and its attached clamping member 48 with the pole 150 and also to orient.