Turn it belly side up.
If there is a retaining ring turnit counter-clockwise to remove it Pop out the ball.
There are three little bearings about the and shape ofa BB
Take a Q tip and dry and or remove any debris on the BBs
There should also be a little black rectangle. This is thewindow that the sensor looks at the ball through,
Clean/dry it with Q-tip. Put it back together and try again.
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