schematic diagram of a rear projection television 10 employing the improved coupler system of the present invention as shown in this figure projection television 10 includes cabinet 12 having projection screen 14 along its front face and slanted mirror 19 along its back face module 13 in fig5 schematically illustrates a coupling system constructed in accordance with the invention which couples module 15 representing a projection lens to module 16 representing a crt tube in practice three couplers 13 three projection lenses 15 and three crt tubes 16 are used to project red green and blue images onto screen 14 although the invention has been described in terms of a rear projection television the coupler systems disclosed herein can also be used with front projection televisions front projection television sets do not include a mirror 19 or a screen 14 as part of cabinet 12 but otherwise operate in the same basic manner as a rear projection television set the success of the coupling system of the present invention depends upon the materials used for the first and second members in particular the first member that member is preferably formed by molding a plastic resin which possesses the basic mechanical thermal and chemical durability properties needed.