During the retracting motion the herring is directed towards the wider side of the tunnel where {HEAD ~ the herring pieces} contact {TAIL ~ the side} to be removed from between the blades as the blades retract 
contact
During the retracting motion the herring is directed towards the wider side of the tunnel where { HEAD ~ the herring pieces } contact { TAIL ~ the side } to be removed from between the blades as the blades retract
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH