Once {TAIL ~ the jogging plate} is positioned at {HEAD ~ the desired orientation}, the four bar linkage assures that the jogging plate thereafter remains parallel to its original orientation regardless of any swinging movement up or down experienced by the linkage assembly 
Once { TAIL ~ the jogging plate } is positioned at { HEAD ~ the desired orientation } , the four bar linkage assures that the jogging plate thereafter remains parallel to its original orientation regardless of any swinging movement up or down experienced by the linkage assembly
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH