There is a Flicker pounding on a hunk of metal on our house. I don’t have the heart to tell him that he isn’t going to dig his way through. This is a time when persistence isn’t going to pay off. Remember this the next time you are persistent in the pursuit of something. You might need to make a change before you can win. May I recommend a jack hammer or moving 6″ to the right where there is wood rather than metal?