The rear brake drum seems to be rusted solid on my son's 78 Matador. Any tips for breaking this loose? I seem to remember this being discussed before, but I couldn't find anything when I tried to search for it. So far I have backed off the brake shoes, and the drum seems to rotate freely. However, when I try to pull it off of the hub there is no movement at all. I verified that the three small screws have already been removed. I sprayed it with some PB Blaster and am letting it soak overnight. I was going to check at the local parts stores to see if I could borrow/rent a drum puller. Thanks, Todd