the top to the outer casing the lock 39 s inward travel is limited by the inward facing surface of handle 44 bearing against the outward facing surface of outer casing 12 the lock 39 s outward movement is limited by stop 48 bearing against the ring gear fig8 shows the assembled invention from the bottom bottom surface 56 preferably includes a plurality of feet 58 these are resilient pads of material intended to provide a good grip on table or desk surfaces the user will also note the previously described fastener and washer in position in the center of the bottom surface while the invention is not dependent upon the selection of any particular material the reader may benefit from some discussion of practical ways to manufacture the invention returning to fig2 those skilled in the art will readily appreciate that top 10 and outer casing 12 may be conveniently made by injection molding other features such as ball bearing case 20 can be assembled by conventional snap engagements the top preferably has a resilient material on its upper surface this could be a bonded layer or an overmolded layer likewise the feet on the bottom of the outer casing could be separate components or could be an overmolded layer the material for the top is preferably heat resistant since laptop computers and similar devices may become hot the foregoing description and drawings comprise.