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Be Extremely Careful There is a small spring between the housing and the base plate of the mouse. The ribbon cable that attachs the mouse wheel is tough to remove. It is compression fit without tabs. I needed to use a small flat blade screw driver to pry it out of the socket. The mouse wheel housing that clicks to the left and right is compression fitted on the bottom only. You can separate it from the other housing by lifting up on the bottom "hinge". The bottom housing is again a compression fit hinge attaching it to the base plate with spring.