I am having difficulty removing the brake drums on my 64 c1100 pickup. I have the service manual and after reading through that section it mentioned a procedure for some setups where a stud cutter is used to remove material at the base of the studs in order to separate the drum from the hub. How do you tell if that is what is needed? I have removed the axle but and locking tab washer and backed off the adjuster for the shoes considerably and it won’t budge at all still.