installation fixture 130 is then attached orthogonally to the first fixture 125 according to one exemplary embodiment of the present invention the orthogonal attachment is accomplished by means of a linear attachment trackway hence according to this exemplary embodiment of the present invention the first fixture 125 comprises a linear attachment trackway 105 according to one alternative exemplary embodiment the linear attachment trackway 105 comprises a notch colinearly disposed into the top surface of the tile support 95 according to this exemplary embodiment the second rail 130 comprises a slide bushing 117 fig8 oriented substantially perpendicular to the tile support 95 the slide bushing 117 fig8 according to one alternative embodiment of the invention comprises a finger that protrudes downward from the top surface of the border of second rail 130 as depicted in the figure the bottom surface of the border is itself partially notched at the end of the tile installation fixture in order to form the finger 110 according to yet another exemplary embodiment the slide bushing further comprises a carrier slot 115 that is also formed by a deeper notch into the bottom surface of the border this carrier slot 115 is disposed in between the finger 110 and the main body of the border of second rail 130 it is important to note that the finger and the carrier slot are typically sized according to a corresponding linear trackway 105 which according to one embodiment comprises a notch in the tile support 95 in.