My front drums are stuck. I've loosened all the lug nuts and took the tire off, removed all the center pieces and bearings. When I try to pull it off the bottom starts to pull off but the top seems to be sticking and wont pull off. Ive used the large mallet, pb blasted and tried the brakr adjustet wheel but they are seized up on both sides. Car sat for 20 years. Any ideas? Do I need to unbolt anything behind the drum?