Abstract: A door forming a part of a closure assembly is attached to the frame of the closure assembly by engaging bifurcated branches of a pivot arm with a pivot shaft. One of the branches is extended to engage a curved leaf spring which is deformed as the door and the extension is pivoted about the shaft. The deformation of the spring is instrumental in exerting a force on the extension to detent the door in the closed position and the extension may disengage from the spring surface when in the open position. To further stabilize the door, a stabilizer is formed on the back of the door and it engages the end of a recessed channel in the assembly, at a point coincident with the pivot axis of the door.