You can bend that piece back a couple of times and then you have to replace the barrel. It's easier to just always leave the hood on and to develop the habit of just setting the focus to past infinity when you stow the lens.
Also worth noting is that for as deep in as you dug, you're not that much further from being able to replace the focus motor and gear train assembly (it's all one part). The motor burns out and the gears can tear up.
The Ballad of Brave Sir Fifty
Bravely bold Sir Fifty rode forth from Calumet
He was not afraid to die, O brave Sir Fifty!
He was not at all afraid to be killed in nasty ways,
Brave, brave, brave, brave Sir Fifty!
He was not in the least bit scared to filled with fungal growth,
Or to have his aperture fail, and his blades broken;
To have his casing split, and his motor burned away;
And his gears all hacked and mangled, brave Sir Fifty!
His threads smashed in and his barrel torn out
And his switches popped off and his ribbons unplugged
And his electronics scraped and his mount fall off
And his primary--