I am out of my element a bit here as mine has disk brakes on the front. However, I do have drums on the rear. So, in the absence of someone who knows what they are talking about
1. Is it binding on anything? With the wheel clylinders, the clip that holds it in place (from Moss) is too thivk - I reused the old (original) one.
2. presume you have the brake shoes in place for your test - are they binding? are they too tight to allow the cylinder to move?
3. If your hydraulics aren't hooked up, what are you using to try to move the cylinders?
4. any pics?
it can't be far off