Use one of our Set-Rite spacers as a Layout Tool and measure off your back stud wall (12 1/2") to line up with the notches at 3 and 9 o'clock positions of spacer. Then, make a mark off either the left or right wall a minimum of 15 1/2" to the 6 and 12 o'clock marks on spacer.
Scribe the inside of the spacer and mark the four (4) notch locations for the perfect hole in the sub-floor.
You can now use a reciprocating or jig saw to cut the perfect opening.
Line up your Set-Rite spacer and new toilet flange, screw down to sub-floor and finish your ceramic tile floor.