depicted in fig4 to either the top of the upper module 10a or to the bottom of the lower module 10b it should be noted that the video display unit with which modules 10 are to be used would of course have its lower surface constructed as is the bottom surface of one module 10 i e so as to mate with the top surface of the upper module 10a also if a wider base were to be desired at the bottom of the modules 10 so as to provide extra stability for the video display unit then of course the upper surface of that base would be constructed so as to mate with the bottom portion of the lower module 10b i e it would have its upper surface constructed as the upper surface of a module 10 in one embodiment constructed by the inventor modules 10 were constructed of plastic noryl n 190 manufactured by general electric co modules 10 had an outside diameter of approximately 6 inches and a height of approximately 2 inches fig5 depicts a preferred embodiment of the invention fig5 is similar to the fig4 view but more simplified and additionally depicts a detent mechanism 31 in its latched position to aid in the description parts in fig5 corresponding to similar parts in fig1 3 and 4 have been.