The problem I have is that the adjusters are seized because the truck has been sitting up for 40 years. I have been working on and studying this problem for 2 days now. This evening I drilled a single 1/2" hole in the front of the brake drum at the same level as the wheel cylinder/adjuster and was able to start busting up the wheel cylinder with a hammer and a punch. Eventually I'll have it broke apart enough that the shoes will relax and I will be able to get the drum off. I was also able to get my bore scope through that hole so that I could assess the situation. I did try penetrating oil and a hammer and punch on the adjusters from the front side but with no luck. Eventually one of the adjusters cracked and broke. It really killed me to have to destroy those wheel cylinders, but it's the least invasive option. I can replace them, its just going to cost me a small fortune.
