What are you calling damage? If it is the heat checking that is a very common condition. Get some one to mike the brake drum. It can probably be cut because it doesn't appear to have been cut before. Up until 15 years ago I used to turn the 16.5x7 drums on my fleet. But then drums got so cheap that I quit doing it. But as expensive and as hard to get I may pull my brake drum lathe out of storage again. I had much better service out of turned drums than the few Chinese drums we bought last year. They turned out to be junk. I bought 4 pallets of made in Mexico drums last week. I am going to try them. If they turn out to be junk, I will be turning drums again.