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