Hi. I have an old house (built 1939) with an inset cast iron tub. The drain is slowly leaking. I bought a tub drai wrench - two actually a and broke both I the process of trying to get it to budge. Even with all my strength and adding an 18 pipe for leverage (for what I estimate to to about 1500 inch lbs of torque) I couldn't turn it. So now I'm left with two options. I can try to Dremel it out but I'm concerned it is so old it may now be a standard size or something like that and who knows the status of the pipe threads.. Alternatively, is there a product I can apply to the underside (like a plumbers putty or alternative) around the old gasket to help seal it, The leak is real slow so even just a little but might do it. What would you recommend?