Wired IntelliMouse Explorer 4.0 left-click only works 98% of the time

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Hi, I have a Wired IntelliMouse Explorer 4.0. The left-click only
works about 98% of the time. As in 2% of the time, the left-click does
not register.

With past mouse devices, I would open the mouse to see if there is dust
stuck in the mouse. However, I can't figure out how to open this
mouse. Are there any instructions on how to open this mouse?

Thanks

.

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