Well duh. My guess is he doesn't have air tools so it's not as easy to get off, which is why he made this thread.You can hammer on it all day, its not going to come off until that lower shock bolt is removed.
Do yourself a favor- when you put it back in, use a bit of never-seize.
Heat it up. Get it hot enough and it will come out easily.I tried an 8mm with air tools and it still would not come off. Wouldn't nudge one bit.