When a leak plagues you for a year and you begin with the simplest item - the toilet flange wax seal - and then through a process of elimination check off other things like the bath overflow, drain, tub surround. Still you see drip drip drip - so you pull the ceiling down to examine where this festering mold causing leak is originating - only to discover it seems to be the toilet flange - so you get another one for $6 and install it yourself this time - and it works!