Sometimes referred to as No43 NEW SAFETY WINDOW OPENING RESTRICTOR KEY OPERATION
In my opinion these devices are of an unsatisfactory design and should not be marketed nor sold as a safety device. My opinion is an educated one and is a wholly relevant one. The use of a spring washer is an unacceptable design method in this instance. In my opinion, a professional person would not sell such a product. In this exceptional case, we are typically dealing with the safety of innocent children. Given these circumstances, I would not wish anyone to use this device. As a safety item, this item is extremely dangerous because it inspires an unwarranted confidence.