i wish to make my garden gate close after someone opens it, if it was wooden, i would have no probs, but its a metal gate between 2 brick piers, next doors gate closes automatically when someone comes in, with no help from door closers, so i'm thinking there must be a way to hang the hinges so that the door closes behind the person. when the gate is opened, the hinges are at right angles to the gate when the gate is closed.