The bracket is in turn affixed to the ends of two lower slide bars and {HEAD ~ one upper slide bar} arranged in {TAIL ~ a triangular configuration} 
The bracket is in turn affixed to the ends of two lower slide bars and { HEAD ~ one upper slide bar } arranged in { TAIL ~ a triangular configuration }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL