As the rod moves in {HEAD ~ the direction} of the secondary extrudate 42 it contacts the primary extrudate 41 and thereafter causes the primary extrudate to move toward {TAIL ~ the secondary extrudate} 
As the rod moves in { HEAD ~ the direction } of the secondary extrudate 42 it contacts the primary extrudate 41 and thereafter causes the primary extrudate to move toward { TAIL ~ the secondary extrudate }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL