Wheel stud
When pushing the stud did you have a receiver for the stud supporting the drum? All you would need is a piece of pipe just large enough that the head of the stud will pass through. When pressing the stud the pipe would support the brake drum and take the force of the press. Cast iron does not like to be stressed and can crack easily. The cones could be very tight. By design the cones tend to clamp to the stud especially if the wheels have been over tightened, it may take some heat on the cones to break them loose.
Paul
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