Just curious huh? i took apart a CZ 20 a few years ago...theres four little flat head screws inside the battery compartment, way at the back.. hard to see, generally covered with some black rtv...if you take those out, you can split the box...
as you split the box, you have to loosen the cable clamps so the wires slide on through too..theres also four screws under the faceplate, you can slide a thin knife under the faceplate and cut it loose from the silicone that holds it there...those four front screws are buried under silicon...the back ones are the easiest way in...once apart, they say you cannot successfully seal it back up to a factory correctness.....though, you may be able to repair it and use it as a wader? Let us know how you do!
Mud