{TAIL ~ The contraction} of spring 20 causes needle 14 to be retracted into the void space 15 in {HEAD ~ sensor base unit} 18 
{ TAIL ~ The contraction } of spring 20 causes needle 14 to be retracted into the void space 15 in { HEAD ~ sensor base unit } 18
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH