FIG 6 also depicts {TAIL ~ a frame top extension} 126 having {HEAD ~ a hole} 128 positioned adjacent the pivoting ball support top extension hole 130, such that a pin or lock can be inserted simultaneously through both holes 128,130, thus locking the pivoting ball support face 132 into its first position 
FIG 6 also depicts { TAIL ~ a frame top extension } 126 having { HEAD ~ a hole } 128 positioned adjacent the pivoting ball support top extension hole 130 , such that a pin or lock can be inserted simultaneously through both holes 128,130 , thus locking the pivoting ball support face 132 into its first position
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH