Sony VGN-UX490N - Manual (Page 137)

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Precautions
On Replacing the Multi-pointer Cap
The cap at the tip of the multi-pointer is a consumable. When it wears out, replace it with one of the two supplied spare caps.
❑ Make sure to put the spare cap firmly in place.
❑ Make sure that the side with a small projection (1) of the spare cap faces upwards when putting it.