G, I never thought about that. I think the runner tube is at its maximum length and maybe I should take it off. It was an experiment and for my kind of driving I would probably have difficulty determining any improvement. The next thing I am going to try though is Leda shocks> I spoke with a very helpful chap there who asked questions about sprung and unsprung weight and said they would build me a bespoke set. My car has slightly more weight than when it left the works but its just the roll bar so that can.t be much and I'm as light as a feather-ish. Meabh.