The pivot arm is then advanced toward the mounting table so that the sector of {TAIL ~ the tire} beads contacts {HEAD ~ the radial perimeter surface} that is defined between the flanges of the wheel  
The pivot arm is then advanced toward the mounting table so that the sector of { TAIL ~ the tire } beads contacts { HEAD ~ the radial perimeter surface } that is defined between the flanges of the wheel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH