The pivot arm then releases the first angular sector of the tire and the press arm moves away from contact with the second angular sector of {HEAD ~ the tire} to allow {TAIL ~ the tire} to return to its initial shape 
to allow
The pivot arm then releases the first angular sector of the tire and the press arm moves away from contact with the second angular sector of { HEAD ~ the tire } to allow { TAIL ~ the tire } to return to its initial shape
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH