I bought a used stainless sink and the four flanges underneath (used to bolt the sink to the countertop) are half-rusted and ugly. I'd like to remove the and use the flat under-surface of the sink with a wooden fram underneath and make a stand for it out of plain 2x4. The sink itself is good and clean but those flanges are too rotted to keep.
I got one of the worst rusted flanges off by pulling/twisting with pliers and hitting it at the seam with a hammer and garden spade, using the spade like a chisel. This technique is not working as well with a less rusted flange.
What would be a good approach?