These little sharpeners usually fail because the customer expects too much. The device is intended as an emergency tool in the wild in case you want to cut the blade easily or have the blade sharp enough (for regular 24 degree blades like a hunting knife). You attach this to your keychain or a hanging point on your gear when you go out into the great outdoors. It's designed to 'replace' a proper set of files and whetstones when you just can't afford the extra weight or bulk on a hike. The blade is bent instead of cutting the new blade. The ceramic side (white) is for keeping the edge of the blade fairly sharp, not for resharpening the blade after you dull it due to mishandling. Handle your knife(s) properly/carefully in the middle of nowhere. They decide to bring an emergency fix instead of a real set of files and gems. and that's fine, but just know what it's used for and what it can do, not what it can do like you might dream.
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