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