Joined: Jul 2010
Posts: 1,211
Likes: 429
From: Signal Mountain, TN
Bikes: '23 Black Mtn MC, '87 Bruce Gordon Chinook, '08 Jamis Aurora, '86 Trek 560, '97 Mongoose Rockadile, & '91 Trek 750
I'd bend it but I wouldn't just start with a derailleur alignment tool. I'd take the wheel out first and sort of smash the whole area back down flat within the jaws of a 5" bench vice. Then once bent back down flattish use that tool to attempt to get it straight.