***Requires a 12mm Bead. I purchased a pack of them at a craft store for a dollar.***
The Legend of Zelda: Twilight Princess boss key
Break connecting pieces and clean them out of the opening as well as shaving them off the inner join of the key fragment. Pop a 12mm red bead into the space intended and super glue the hing in. If the bead is the correct size, it should hold in there firmly on its own without any play.