Lenovo ThinkPad R400 7439 Hardware Maintenance Manual page 78

Table 14. Removal steps of palm rest (continued)
3. Push the front side of the palm rest until it clicks into place.
4. Close the LCD cover and turn the computer over. Then fasten the four screws
to secure the palm rest.
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ThinkPad T400 and R400 (14.1-inch widescreen) Hardware Maintenance Manual