OK – so my toilet sprung a leak and stained the kitchen ceiling. The toilet had been wobbly because the flnage sat too high off the floor. I decided to fix the situation by removing the flange and putting in a modified one that would sit lower to the floor. But the old flange is glued in place and I can’t budge it. I tried to chip it out but now am left with a 4″ pipe with an uneven interior surface. Any suggestions?