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Use an adjustable wrench correctly
An adjustable wrench isn't the ideal tool for loosening stuck fasteners
because it can round over the head, making matters worse.
But if an adjustable wrench is your only option, here's your best
shot at preserving the shoulders on the nut or bolt head: Slide on
the wrench all the way, so there's full contact at the back of the
jaws. Then tighten the wrench thumbscrew so there's no play at
all in the jaws. Always turn the wrench handle toward the lower
jaw, never away from it.