{HEAD ~ This movement} causes the compensating spool to reduce the opening of one row of cross sectional holes and increase {TAIL ~ the opening} of the other 
increase
{ HEAD ~ This movement } causes the compensating spool to reduce the opening of one row of cross sectional holes and increase { TAIL ~ the opening } of the other
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH