Gravity should bring it down. It is already folded away during storage and the when the dish raises the arm should not raise until lifted by the dish. I believe that there are also springs there to help hold it during windy conditions but getting it lubed up should get you back in business unless it it badly rusted or damaged.
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?