Corroded Bathtub Flange - DIY Home Improvement, Remodeling ...

I doubt that you will have any cross bars left to use a dumbell wrench and the internal wrenches aren't worth a damn...

I'd go right to Plan "C" see the picture below...

Have you been using a bunch of chemical drain openers or something? I'd wonder about the condition of the rest of that waste & overflow assy.

Source: http://www.houserepairtalk.com/f33/corroded-bathtub-flange-11348/

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