Originally Posted by 3alarmer

...have you tested it in the frame you want to use it in ? If the head tube and stack height of your chosen headset in use is enough shorter than the bike it came out of, you should be able to just avoid the portion with the damaged threads, and shorten the fork steerer a little bit. But yeah, I can't tell whether the threads are damaged, or you just have a bunch of aluminum clogging things up in there.

Clean the threads up with a wire brush and see where you're at then.