As previously stated, the timing disc 51 provides very accurate information defining {HEAD ~ the position} of {TAIL ~ the web} 
As previously stated , the timing disc 51 provides very accurate information defining { HEAD ~ the position } of { TAIL ~ the web }
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 TAIL