there is an easier way to get a measurement that can be transfered to another racer. take the calipers with the little rod that goes out the bottom. run it down to the end of the clutch nut. ""IMPORTANT"" ZERO THE CALIPER. Then run it down to the spring tension nut. look at the dial or digital readout and this is your clutch adjustment. I set mine tun in .80mm that is with the light weights, silver JP spring, grey shoe. I have used this setting with an MR12, X-12 and FX12m. Works great.