at least two support bars having {TAIL ~ bores} in {HEAD ~ the center} transversely mounted on said supporting shank 
at least two support bars having { TAIL ~ bores } in { HEAD ~ the center } transversely mounted on said supporting shank
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH