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