You are 100% correct these rockers are good to over 10,000rpm. I personally have T&D rockers and break one every year. Just the way it is. Aluminium can only handle so many cycles before it fatigues and breaks. Soon my 360-1 will be up for sale with the rockers or they might be the next ones that I make for Crower. But not to many people are buying Indy because they are people friendly over there.