I have a small problem. I have a 65 C60 with a drivers side rear drum that refuses to come off. It spins freely. I have tried prying, tapping with a hammer....the adjusters will not back off.They don't appear to be rusted either....any tips or tricks to get this thing off?

1965 Chevrolet C-60 292 Flatbed
2008 GMC Sierra SLE Z71 Crew Cab
1992 Chevrolet C1500 Cheyenne 5 Speed
2001 Harley Davidson FLHT Electra Glide Standard