{TAIL ~ The sensor assembly} preferably includes a U shaped support bracket centered about the elongated opening and a pair of sensor block members secured to the support bracket in {HEAD ~ facing relation} 
{ TAIL ~ The sensor assembly } preferably includes a U shaped support bracket centered about the elongated opening and a pair of sensor block members secured to the support bracket in { HEAD ~ facing relation }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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