Note that refers to the Powerbook G4 15" and 17", which I believe take the newer, smaller (but similarly shaped) power connector. So it may not be relevant to a 1400.

By "outer sense shell" do you mean the metal ring around the connector? The OP's first language is not English (no offence intended leosadvs, your written English is very good). Mine is, and I had trouble parsing your post.