Introduction
Make sure to be careful you keep track of which screws you are using and which screws go where when disassembling. There are different types of screws used- one type being the screws used to separate the plastic shell and the other used to unscrew the scroll wheel itself.
Tools
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Peel back the two teflon tape from the top corners and the one larger one from the bottom with a spudger.
 
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Gently remove the top plastic plate of the mouse.
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Unplug the white cord from the circuit board.
 
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Gently wiggle the scroll wheel up and back to remove the scroll wheel from the mouse.
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Use your thumbs to pop the scroll wheel out from its plastic frame.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.