A fastening or mounting apparatus for releasably joining two objects is disclosed. The apparatus has a first component and a second component. The first component may include a plate, two side walls and two flanges extending from the side walls. The second component may include a plate, a first lip and a second lip. The first lip has a cavity holding a resilient element. The second lip may have a convex portion and at least partially define a detent. One of the flanges engages with the resilient element in the cavity while the two components are non-parallel. The first flange compresses the resilient element while the second flange contacts the convex portion. The resilient element biases the second flange against the detent once the two components are parallel.