My bathroom faucet was spewing water at odd angles. The aerator was obviously old and plagued with mineral deposits. So I attempted to remove the aerator to clean/replace it.

With WD-40 and vice grips I was able to get it to unscrew about a quarter turn, but when I tried to reposition my vice grips, the aerator broke in two. The top half with the threading is still stuck in my faucet. Any way to remove this without replacing the whole faucet? I can add a picture if it helps.