Jim - at the risk of being accused of hijacking Skip's thread I have to ask more about the geometry change you observed. Reason - the frequency at which I'm getting a shimmy (and it is getting worse) has been increasing lately. I don't have any idea of how to tell if or how much my spring(s) have changed over the 450 landings I've made. (And, it goes without saying that they were perfect. ) Any ideas/suggestions would be appreciated.