sirion 1998 rear brake drums!

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Hi everyone, I new to Daihatsu's and have just purchased a 1998 sirion. Last weekend i tried to replace the rear shoes, however i was unable to get the drum off! I tried hitting it with a hammer but this didn't work. I couldn't see any bolts to undo and there aren't any threads on the front of the drum. Any help would be appreciated as workshop manuals are impossible to get, unless you know otherwise!
thank you, David