How do I go about extending a 2" Brass shower drain in a custom pan shower floor? The tile layer had tiled half the floor before he realized that the plumber had extended the drain to it's full length. Consequently, the tile guy changed his slope just before he got to the drain causing an uneven floor condition. He can tile over the original tile using a special epoxy but we need to extend the drain by 1-1 1/2 inches. Any ideas would be gratly appreciated.