Then suggestion regarding backing off on the star gear is the first step.
However, if that does not work, rent a large brake drum puller.
The drums become attached at the hub in the center. I experienced the problem
and tried heat, penetrating oil and numerous shots with a hammer to no avail.
If there are no rental places nearby, Eastwood and J.C. Whitney sell them for
Attach the drum puller and crank down on the drum until it starts to distort
and then hit the center driver with a large hammer. That should do the trick.
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