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