Product review (5 stars): Perfect replacement for 20 plus year old Whirlpool Refrigerator
The original factory thermostat had a small screw that would allow for fine tuning of the temperature.  This screw was mentioned in several of the other reviews, but the thermostat that was received does not have this adjustment screw.  Installed in refrigerator and set the temperature selector in position normally kept previously and the refrigerator section keeps a perfect 38F temperature.  This was shown as an amazon prime product but delivery exceeded 5 days.