Introduction
Tools
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            The Xperia L model 
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            Gently open the phone case. 
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            The phone body, back case and the detached volume control button. 
 
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            Using the plastic opening tools in the iFixit kit, pull up the flattened plastic notches that will hold the volume control button in place. 
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            You can see the notches on the back case and the holes in the volume control button that snap fit in them. 
 
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            Place the volume control button back in the slot. 
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            Adjust the holes on the button in a way that they snap to the raised notches on the back panel. 
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            Press down the raised plastic notches using the back of the plastic opening tool from the kit. 
 
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            The volume control button is now attached in its slot. 
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            Reassemble the phone back by snapping the back case to the phone body. 
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            The volume control/zoom button is good to use! 
 
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To reassemble your device, follow these instructions in reverse order.