The pivoting ball support movement prevention means can include a slot in the top of {TAIL ~ the frame}, through which {HEAD ~ the pivoting ball support top extension} protrudes 
through protrudes
The pivoting ball support movement prevention means can include a slot in the top of { TAIL ~ the frame } , through which { HEAD ~ the pivoting ball support top extension } protrudes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH REL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL