remove the deck, remove the spindle, and pound it out with a sledge hammer and a board. you can get it pretty much back to normal USUALLY.

Yep, the sledge hammer is about the only way to go with that. I had to do that job on a Craftsman deck, and my Porto-power auto body jack wouldn't push it, so i tookit off, turned it over, and about beat it to death with my BFH, but i got it done! That was last summer---and now, the guy called me about a week ago or so, and sez he hit the same rock and did it again! Guess i'd better get over there and fix it.

The only problem with the hammer method is the blade/spindle assembly in not likely to be perfectly true to the other blades/spindles when you are done. This is a real pain but you might over bending it "up", reassemble it and then bring deck "home" while the deck is on the tractor constantly measuring where you are relative to the other blades.