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