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