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