Lenovo ThinkPad X220 Maintenance Manual page 76

When installing:
When you attach the palm rest, do as follows:
1. Attach the touch pad connector firmly to the system board.
2. Press the left and right top edges of the palm rest to fit it into place.
3. Push the front side of the palm rest until it clicks into place.
4. Close the LCD cover and turn the computer over. And then fasten the five screws to secure the palm rest.
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Hardware Maintenance Manual