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