[Mark / Ohio]

....I have one of these in my tool box, and use it fairly often. It's pretty inexpensive, and gets the job done. For those not familiar with this sort of impact wrench, you twist it in the direction you want to apply force, in this case to loosen, and strike the end of the impact with a hammer. It may take several blows to loosen the nut.

Now I'm going to have to buy one of those. Never saw a manual impact wrench like that before. :cool