a securing rod inserting through said bores into said support bars and being capable of screwing into one notch on said securing plate, thereby locking {HEAD ~ said supporting shank} into {TAIL ~ one position}; and 
into
a securing rod inserting through said bores into said support bars and being capable of screwing into one notch on said securing plate , thereby locking { HEAD ~ said supporting shank } into { TAIL ~ one position } ; and
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH