{HEAD ~ A switching device} is operatively connected to {TAIL ~ the shackle device} and is actuated when the predetermined magnitude of relative displacement between the pistons is reached 
is operatively connected to
{ HEAD ~ A switching device } is operatively connected to { TAIL ~ the shackle device } and is actuated when the predetermined magnitude of relative displacement between the pistons is reached
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH