Quote: The expansion or the quality of the metal used in both or either the head or the rocker is suspect
In all fairness to the manufacturer, until you're done speculating and have solid evidence as to the cause maybe you shouldn't be pointing fingers. You said yourself you set them on the tight side, seems to me the problem was the guy at the end of the wrench!
I have seen two sets of heads that have had quality control problems These are not a quality product and people need to know more......
