This video shows the "before and after" of what happens when a shaft is installed without spine alignment and then with spine alignment such that Flat Line Oscillation occurs. Having a shaft installed in this way can help decrease shot dispersion. It also shows that some shaft companies do mark their shafts main spine. Contact your local clubfittermaker for more info. More info also at www.yourgolfshop.webs.com
Golf shaft FLO
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