Abstract: A surface for mounting an item in a container is provided with clamping members which restrain the item against the surface. Each clamping member includes a frustum-shaped lug having a gripping portion on its periphery, and also has a resilient member for mounting the lug to the mounting surface so that at least a portion of the lug is movable in a generally perpendicular direction with respect to the mounting surface. In use, a plurality of clamping members are secured to the mounting surface so that their gripping portions engage the perimeter of the item when it is received on the mounting surface. With the item in this position, the clamping members restrain it against the mounting surface.