The support members comprising support arms pivotally attached between {HEAD ~ brackets} positioned on {TAIL ~ the mounting surfaces} 
positioned on
The support members comprising support arms pivotally attached between { HEAD ~ brackets } positioned on { TAIL ~ the mounting surfaces }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL