Just place the crocodile clip on the case. If you want good results try to find a part that's more exposed or thin layered. But honestly, you don't really need the wristband. I've rebuilt my computer over and over again on that kind of carpet in my house and nothing has been shorted or shocked. Just keep touching your case for every single electronic part you touch and you'll be just fine. I personally don't like being strapped on to something. I feel like I have a ball and chain...
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