from a solid lightweight material such as aluminum and has a box like form with an open top and an adjacent open side a pair of spaced apart flanges 24 with a hole drilled through are conventionally fastened to the bottom end of the strut member 20 as best shown in fig1 the first hole 23 is drilled offset toward the closed side of the box like form of 20 that is from the longitudinal axis of the strut member 20 for a purpose to be described later on returning back to fig4 a a second hole 25 is drilled through the first and third sides 26 27 respectively of the strut member 20 in a spaced apart relationship to the first hole 23 and centrally located on longitudinal axis 28 of the strut member 20 the top end 9 in each of the first and third sides 26 27 respectively of the strut member 20 has a horizontal edge 8 extending from the closed side 7 a partial hole 6 bored in the horizontal edge 8 above the second hole 25 and an angled surface 5 extending from the partial hole 6 to the open side 22 a biased handle 29 is pivotally mounted in a hole drilled near the closed side 7 through the first and third sides 26 27 respectively of.