Stiffener

One way valve in KAYABA scissors Jack does not keep good oil pressure again, passing through in a copper washer was the reason finding out distortion of thickness also. Then I come to the conclusion that the strength of a most important parts is not enough to support heavy vehicle weight leading to dysfunction. Human body is not designed to endure the heavy weight of 500kg nor we have not been making progress to survive in such a severe condition, surely falls into fatal under the car in case of accident. We should not rely on this small piece of tiny copper washer
I have counter-measured to stiffen this part with steel washer and brass washer for actual valve function. I have realized again that oil pressure jack is far from safety nor reliable, this device does not match with continuous use and should be used at the moment only for lifting up and some rigid supporting piece should be replaced ASAP. This law should be kept in mind to have ultimate safety whenever lifting up and working under the car.