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I'm going to try and answer this one? They sell a brake centering tool with a dial indicator on it. To use this tool you would first have to adjust the top brake adjusting wedge. Second adjust your brake rods. Now slide your drum off. Install a brake centering tool check the top of the shoe and then the bottom, if they don't read the same then maybe the roller track is wore out and so is the pin that rides on the track. Hope this helps.
carry on nick c