Some time the screw is a set screw and needs to be loosened to adjust the valve. Others are adjusted by the screw. Either way you might need a larger driver the break the tension on the screw. Factory set it can be tight.
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Some time the screw is a set screw and needs to be loosened to adjust the valve. Others are adjusted by the screw. Either way you might need a larger driver the break the tension on the screw. Factory set it can be tight.