A first pressure chamber of {HEAD ~ the cylinder} is connected to a first supply line , for setting a smaller displacement volume while a second opposed pressure chamber is connected to a second supply line , for setting {TAIL ~ a larger displacement volume} 
A first pressure chamber of { HEAD ~ the cylinder } is connected to a first supply line , for setting a smaller displacement volume while a second opposed pressure chamber is connected to a second supply line , for setting { TAIL ~ a larger displacement volume }
OTH OTH OTH OTH OTH 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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL