The little brass arm is supposed to be a safety switch. In one position the release lever bumps into the brass are and will not turn so the quick release willnot come off. In the other position the brass arm is away from the lever so it swings freely and the quick release plate will come off. With the brass arm open the quick release lever shoulde lock open until you push the quick releae in place. If none of this seem to work on your head, you may be missing parts. Try
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