A retaining apparatus includes a base member having a backing portion engaging a first side of a fixed plate and a cleat engaging a second side of the fixed plate. A neck portion connects the backing portion to the cleat and slidingly engages a keyway hole in the fixed plate. The retaining apparatus also includes a locking member coupled to the base member by a hinge. The locking member defines a disengaged position spaced from the fixed plate and is pivotable to an engaged position to secure the apparatus to the fixed plate.