Adjust the tension when the cut is no longer sharp and clean. If the blades are too loose, the pruner will bind on larger branches; if the blades are too tight, then extra force is needed to make the cut. Adjust the center screw or bolt until the blades are properly aligned and rub slightly along 2/3 of their length.
For more information obout sharpening pruners, see our story Staying Sharp.
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