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Thank you for responding. The problem is I don't have a wood floor and subfloor. It is cement between the upstairs and downstairs and I think that is where I have to be careful to not crack the cement floor. I think that is why I have to use cast iron to keep the rigidity.

This is 1941 ranch house with a cement floor between the main floor and basement. It has cast iron pipes. The flange has finally rusted away. The hole is an oval shape that the pipe goes through and it looks like they used grout or some type of cement between the pipe and base of the flange...