I have an oak in my backyard that was hit by a falling tree back in
2004. The trunk is 14" - 16" in diameter and the tree is probably 25'
- 30' high. The falling tree pushed the top of this tree into an oak
next to it, and all the branches got tangled. Well 3 years later and
the oak has a pronounced bend in the trunk and has been growing into
the other oak. I would like to bend it back to its original
position. I was thinking of attaching a steel cable as high as I can
get it and use some sort of winch/come-along/ratchet attached to
another tree in the yard to slowly pull the tree back into its
original position over time (or even a little further along). Is this
feasible?

You can see the tree at:
http://www.spilledwhine.com/pics/benttree1.jpg
http://www.spilledwhine.com/pics/benttree2.jpg

Thanks,
Tom Kuhn