If its bent in the tube then you are out of luck... not to mention you'll need to replace the mount/tube anyway.
If its just the end that is bent, I've been able to slip a fine toothed sawsall blade between the bushing and the bulkhead tube and cut them off then get them out.
But I'm guessing you have it bent in the tube and in that case its just going to require replacing the mount.
sled_guy