Lowe's sells a 3 pack of belt wrenches, I'm sure the large one would work. I also would soak them longer. I have found over the years that when a job isn't going like it should, take a break, drink a beer or beverage of your choice, kick the dog, kick the cat, then go back and presto the task can be accomplished. If not, go back and kick dog and cat again. :-D