To restart the cutting wheel, {HEAD ~ the operator} slowly releases {TAIL ~ the pedal valve} which starts the wheel rotating again 
slowly releases
To restart the cutting wheel , { HEAD ~ the operator } slowly releases { TAIL ~ the pedal valve } which starts the wheel rotating again
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH