Because of {HEAD ~ the precise positioning information} provided by {TAIL ~ the timing disc}, manufacturing tolerances become significant 
provided by
Because of { HEAD ~ the precise positioning information } provided by { TAIL ~ the timing disc } , manufacturing tolerances become significant
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH