{HEAD ~ A slidable tubular insert} is carried within the principal conduit member and moves from {TAIL ~ an opened and closed position} to open or close an opening in the principal conduit member and permit a formed article to move within 
moves from
{ HEAD ~ A slidable tubular insert } is carried within the principal conduit member and moves from { TAIL ~ an opened and closed position } to open or close an opening in the principal conduit member and permit a formed article to move within
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH