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