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MacBook Unibody Model A1278 Upper Case Replacement

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Tighten the outer two screws along the inner edge of the trackpad and check the alignment of it on the outer side of the upper case.

If its alignment looks good, install the rest of the Y0 Tri-wing screws along the inner edge of the trackpad.

Before reassembling your machine, verify that the set screw is still installed in a position so the mouse will click correctly.

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