I have a drain for a bathtub that is stuck and broken. I was able to get it to turn, which seemed like a good thing, but looking in the drain, the fitting is turning as well. I tried using the flange to turn it, but it broke off.
I was going to try a chisel to pry the drain inward, but it moves enough that I'm afraid I will destroy the plumbing the drain is connected to. When I try to use pliers to pry the drain inward, the whole thing turns. If I can get it to bend, a piece breaks off.
It's broken to the point where I can't get more little pieces to break off, so I don't know where to go from here to remove it. 
Best Answer
There is a special wrench that looks like the traditional rook chess piece (castle) It matches up with the cute cross bars that catch long hair, and the last bit of a bar of soap.