Hi Stefan,
I just wanted to clarify that the O-rings are simply a better way of keeping the oil in the strut from leaking out. The mod does not convert it to an air/oil strut. It's the absence of the oil due to leakage, that usually causes the spring to break. When the oil in the strut is forced through a small orifice, a damping action occurs, preventing the strut from continually bottoming-out. Bill