An impact wrench (air tool) might be helpful. Also, I like WD40 but it is really not designed as a penetrating oil. Try something like liquid wrench to help dissolve some of the rust. I am sure you have tried a long extension to a ratchet with a possible cheater bar. Wrench hit with a rubber mallet sometimes works too. I go for the impact wrench.
Thursday, May 1st, 2008 AT 6:22 PM