found in some cabinets which use the conventional anchor socket illustrated in fig2 the base member 50 is provided with four protrusions 51 which seat in the four mating recesses 53 circumferentially spaced about the edge of aperture 54 once the base member 50 is positioned over the aperture 54 it can not move laterally relative to the cabinet 12 nor rotate in the aperture 54 in order to prevent the base member 50 from lifting out of the aperture 54 the following method of assembly is used the base member 50 is provided with a centrally located and downwardly protruding nipple 55 having a rivet receiving orifice 56 therein and a screw head rivet 57 is inserted through the rivet receiving orifice 56 from above and is further inserted into the receiving orifice of a locking element 58 this locking element 58 is flat and has four circumferentially spaced protrusions and is shaped so that it can mate with but pass through the aperture 54 as seen in fig4 the base member 50 the rivet 57 and the locking element 58 are attached to each other fig4 shows rivet 57 with its end 57a flattened so as to retain the locking element 58 the rivet 57 is sized so that it is tightly received by the orifice in the locking element 58 so that the locking element 58 can be rotated by turning the rivet 57 when installing the base member 50 the locking element 58 is rotated so that its protrusions.