Dell Precision M4300 (Mid 2007) - Manual (Page 41)

Using the Keyboard and Touch Pad
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1 Pull the cap off the track stick.
2 Align the new cap over the square track-stick post and gently press the cap down onto the post.
NOTICE:
The track stick can damage the display if it is not properly seated on the post.
3 Test the track stick to ensure that the cap is seated properly.