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See if you can find any visible blockages of the bar lock. If possible, try taking the knife apart to clean and maintain it, and perhaps that will show the blockage. Perhaps the knife just needs some oiling. If that's the case, again, make very sure no fingers are in the way, because it will close much smoother than you may be used to, putting your fingers at risk. Finally, if none of these work, take it to a knife shop.

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