You don't need to open it to replace the blade. You pull the blade all the way out and you will see that it is hooked to a spring. All you have to do is unhook the old blade and connect the new one and slowly let it wind back in. Remember to hang on tight to the spring so it doesn't snap back in before you get the new blade connected. If you do need to take it apart, there should be screws holding it together.
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