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How is the brake installed? What kind of brake? It is usually easiest to put something into the side or through the brake and then use heat to loosen the Loctite and twist it loose and un-thread it.
I use 2 pieces of 3/4" plywood, 4"x4" with a v notch groove cut through the center of both. And my big vise, bolted to the work bench. Sandwich the barrel.