A blade means has a blade received therein, {HEAD ~ the blade} slidably engaged in {TAIL ~ the passage way} of the head portion 
slidably engaged in
A blade means has a blade received therein , { HEAD ~ the blade } slidably engaged in { TAIL ~ the passage way } of the head portion
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH