Step 4 · Remove Old Faucet Mounting Hardware
Using your basin wrench or deep-socket wrench, loosen and remove the large mounting nuts securing the faucet handles and spout to the underside of the tub deck. These can often be corroded and difficult to remove. If they are stuck, apply a small amount of penetrating oil and allow it to soak in for 15-20 minutes before trying again. Once the nuts are off, collect any washers or mounting plates.