Introduction
Tools
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The mouse cover at the bottom should move freely but at the top is hold by 2 brackets
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In order to remove the mouse cover, you will need to rock left/right the cover and slide it down (from scroll wheel toward the Lenovo logo)
 
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The micro switch can be replaced by OMRON D2FC-F-7N but you need to trim the solder terminals with a flush wire cutter
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.