Help! I'm trying to replace a kitchen faucet and absolutely can not get the existing faucet off. The mounting nuts under the sink are stuck in place and nothing will budge them. I have a basin wrench and the only the only thing I've managed to do is entirely mangle the soft plastic nuts. I've tried WD40, pliers, vice grips, and the basin wrench. I've been working on this on and off for 2 weeks now. I'm ready to take a hacksaw to the thing. What can I do??