Once the extrudate is sufficiently buckled, {TAIL ~ the second diversion rod} is thereafter returned to {HEAD ~ its original position} 
Once the extrudate is sufficiently buckled , { TAIL ~ the second diversion rod } is thereafter returned to { HEAD ~ its original position }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD