Loose Slip joint Blade

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Sometimes a good jet of air can blast out the crap that's accumulated over the years, or if the materials allow it, submerging in warm soapy water for a while and opening and closing the blade. Cocktail sticks are good for scraping harder stuff out if really caked on. Then oil it up and work it in.

However, if it's not due to crud, it could be that the spring bar has lost tension or the spring face/blade tang have been worn down and therefore no longer have a smoothly defined open and close.
 

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