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A comment on The History of Apple Mice in Pure CSS. Parent comment

Re:The History of Apple Mice in Pure CSS by rz2k on Saturday October 19, 2013 @12:11PM (#6576860)
The scrolling ball needs to be regularly cleaned by turning the mouse upside down and rolling it on a clean piece of paper.

When it is dirty it will seem like it is broken and only track in one direction.

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