If you notice a cupping position in your left wrist your club face is not square at impact. “Original” Straight Arm golf teaching aid. TheStraight Arm has already helped a large number of individuals and is being used by a number of Golf Digest, Golf Magazine Top 100 teachers, Golf Schools and Golf Academy's, Master PGA Professionals and Tour Players through the years experiencing the benefits of theStraight Arm since 1991.