Remove mouse feet
To get to the screw we need to scratch off the rear mouse feet. Use the screwdriver or your fingernails to gently remove it. We want to reuse it afterwards, so stick it to a dustfree and dry place. The botton of your copperhead is a fine place for that purpose.

  Remove Screw

Under the feet you`ll find the screw  that holds the casing together. Take your screwdriver and remove it. Only apply gentle pressure. If it doesn't move, try the other way round (remember unscrewing is counterclockwise).
 

 Open hull

Now firmly prey apart the back of the hull as shown on the image (click it for a larger version). The hull will stick together at the front. If it doesn't move check that the screw is completely removed. You can also try to gentle stick your screwdriver between the two parts. Again, don't use too much force or you could break the hull. Now move the upper hull backwards as shown on the image.

To fully seperate the upper and lower hull you'll have to remove the cable that powers the breathing snake.