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How do I replace the enter button on my builtin mouse?

Hy Lincoln Normaly the Touchpad or the Keyboard are replaced as a whole item. What is the problem with the button? Greetings Daniel

Its a simple job, you can buy a complete palm rest with the touchpad circuit as a combo or the touchpad board separately (on ebay) and take the top cover off and/or just unscrew the old touchpad board and replace it., its held on by screws.