OK, this is a stupid question, but I'm not feeling well and I don't have much patience right now. I have a Microsoft Optical Wheel Mouse that is double-clicking about 50% of the time instead of single clicking. I can hear what sounds like a spring bouncing when I click the left mouse button, and I want to open it up. Does anyone know if there's screws under the pads on the bottom, which I can't seem to get off?