I broke the mouse wheel on my newly bought Microsoft Wheel Mouse Optical by smashing it fiercely on my desk while red veins passionately throbbed on my sweaty, wrinkled forehead (no comment). The wheel has "sunken in" the mouse, and doesn't register anything at all. I tried fixing it without opening the mouse, but to no avail.

Is there a way to open and close the WMO, to fix the wheel? Has anyone encountered the same problem?