I have been gathering data on TT users arm length and MgR/I. The aim is to find a link, or a multiplier between arm length and MgR/I. I just thought I'd run this by you to see what you think, and to critique my methodology. The answers would be compared against your data, if you are willing, since your MgR/I is fine tuned. Here is the questionnaire I sent out. What is your swingweight? Do you wear a wristband? Single wide or double? What is your forehand grip? Do you choke up or down from the middle of the handle? Could you measure from the top of your shoulder to the end of your middle finger? What is your personal MgR/I value? I've realized that people have probably been measuring from different points of the shoulder. I've come up with the following method to get accurate arm length results. I can't think of another method that doesn't start from the neck, or involve knowledge of shoulder anatomy that I don't possess. To measure use a tape measure with a clip on the end, like this. Guide the clip up your arm until it rests on the tip of your shoulder.Measure from here to the end of your middle finger.