{HEAD ~ The support arms} are pivotally attached through {TAIL ~ rotary shafts}, which are individually mounted at opposite ends of each of the support arms 
{ HEAD ~ The support arms } are pivotally attached through { TAIL ~ rotary shafts } , which are individually mounted at opposite ends of each of the support arms
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH