{TAIL ~ a helical spring} held within the housing, the helical spring biasing the slider against {HEAD ~ the second portion} of the arm 
{ TAIL ~ a helical spring } held within the housing , the helical spring biasing the slider against { HEAD ~ the second portion } of the arm
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH