The pull-through gadget — sharp for a week, then worse than before
FAILED
This is the one everybody owns, because it feels like it works. Drag the knife through, hear that horrible zip, and the edge does feel sharper — for about a week. Here's what's actually happening: the carbide notch tears steel off the edge in ragged strips. The thin, weakened edge folds over almost immediately, so you drag it through again. And again. You're not sharpening your knife; you're quietly sanding it to death. Mine took visible chips out of a blade I liked. Verdict: the reason your good knife died.







