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Opening a stuck locking biner

Sometimes a screw gate locking biner can be almost impossible to open, especially if it has been weighted and unweighted.  Here’s a trick that usually works:  Clip (or girth hitch) a long sling to the stuck biner. Stand in it, (or maybe bounce on the sling) and at the same time, unscrew the gate.  This “stretches” the metal just a tiny amount, causing the threads to loosen a bit.