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What do O-rings do on a mechanical keyboard?

What do O-Rings Do on a Mechanical Keyboard? In this video, Betty from Switch and Click goes over what O-rings do to your ...
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Not All O-Rings Are Created Equal

That box of assorted rubber O-rings under the workbench in your shop might supply the cure to leaky hydraulic connections, or it might just interrupt the leak for a day or two. Flat-face hydraulic ...