We are trying to change timing belt on 91 Accord single over head cam. We can't get the bottom nut/pully off to get the bottom shield off. We are holding the pully with large rubber strap wrench, so far have twisted cheap 1/2" 10" extension by using 3' cheater pipe and 2' breaker bar. I have also tried air impact to no avail. We are also turning counter clockwise. Any suggestions?