I have usually had no problems in replacing digital watch batteries. However, my Casio #2587 (similar to 2406 and 2583) Wave Ceptor watch has me stumped. The CR1620 battery is held down by a very thin metal plate that covers most of the back of the watch and appears to be clipped to the body of the watch by four ears that are part of the plate (each ear is on the perimeter of the plate and at 90 degrees to the plate). I wonder if there is some release mechanism to free this plate or does one forcibly unsnap the plate (and, if so, is there a specific ear that should be unsnapped first?). Any suggestions would be appreciated.