Are you trying to remove the drum? Or trying to break the single piece hub into two pieces?

To remove the drum try a rubber mallet on the drum to wiggle it off the hub.

At some point you have to take the whole thing off the spindle to finally remove drum from hub.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-