I took off the rear brake lines today, and started to try and redo the back drum brakes, but I can't budge the old drum off even with hammering. Am I missing something. Are these things pressed on, or do you have to remove some hidden bolt or hub to the axel? Every rear drum brake job I have ever done you just pull the hub off. Suggestions for getting it off intact appreciated. The pads do not appear to be sticking as I can freely rotate it and the parking brake is off. Steve