Operating the TrackPoint III Pointing Device
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IBM ThinkPad 310E/310ED: User’s Guide
Cleaning the Cap
The cap on the end of the TrackPoint III is removable. You can
replace it with one of the spares shipped with your computer when
the cap is worn out.
To maintain a smooth pointing operation, occasionally clean the cap
with a soft cloth moistened with a nonalkaline detergent.