Rear driver side drum removal

I can't get the rear driver side drum off to check the brakes. The passenger side came off with no problem at all. I've tried tapping on the drum with a hammer to work it off. Years ago there was a way to work the adjusters loose on a car by an opening on the backside of the assembly however on this I'm not finding one. It's been "a day or three" since I've done this.