A rosebud and a big hammer. Why is it made like that? There should be a gusset sloping down from just low enough to clear the cylinder to the front of the bracket to support the cylinder post. Poor engineering?
Unless I'm missing something, the steel here should not have been cut out.
If there is a way to tie that jaw down you might be able to heat it with a torch and use the cylinder to pull it forward. You wouldn't have to worry about the post bending out of alignment that way. You'll for sure have to brace the post after you get it back straight because it will never be as strong as it was.
Best of luck to ya...