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Glad to help MASH, good luck with the work.
Seconding AT63, if you have problems with one side, you have problems with both, unless it's a "GET ME HOME!" repair.
Penetrant and spot heat. I use a butane soldering iron with the tip removed. Kroil or PB penetrant. and let it sit a bit. Tapping with a small hammer around the screw countersink helps.
Then use a screwdriver with a wrench bolster, as you can tighten then loosen to break the rust and layers of...
Remove the three slotted screws, then pull it off.
You may have to back the adjusters off if the drums are really worn.
Also, it sometimes rusts to the flange of the hub, so a little penetrant and tapping (not bashing it with a sledge) will loosen it from the hub.