a club stroke alignment tool is used to evaluate and modify a club stroke . the club stroke alignment tool includes a contact plate that is rotatably coupled to a base that is movable on a surface . when hit with a club , the club stroke alignment tool provides data about an amount of rotation of a clubface , discrepancy from a center strike , and swing trajectory . the data is compared to a predetermined standards to find one or more discrepancies . if discrepancies exist , the stoke is modified to reduce the discrepancies on the next impact between the club and the club stroke alignment tool .