It's just a slotted metal box. All 9 screws are installed, but none of the screw holes are threaded. You'll end up with tiny screws half ripped off and you'll need some muscle strength to remove them. How long does it take to fill screw holes? This is how assembling a Pi with a horizontal fan becomes a puzzle. You need to remove the fan from the Pi and the plastic plate you are attaching the Pi to. Then you have to do a lot of detailed work and a lot of patience to figure out which stop goes where and which bolt and which screw and which nut and all that. NO instructions are included. If you pass this test and turn the fan back on without tearing the heatsink plate, you should be able to install it in your case. Only 2 screws hold it in the case as it uses the HDMI and power connectors to hold the other side. If you go as far as actually inserting those screws without removing them. You understand that your WiFi is protected by an all-metal housing. Then you realize that there is no way to install or remove SD card without some tools. Hopefully you don't have to access it without cutting through the case with a hacksaw or dremel. fun project. I had to return it and leave the Pi bare.
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