The arm rotates about axis A with an angular range of rotation of {TAIL ~ the order} of {HEAD ~ 60 degrees} 
The arm rotates about axis A with an angular range of rotation of { TAIL ~ the order } of { HEAD ~ 60 degrees }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD