Check the listing for details. The Duffix Golf Swing Trainer Reduces Hooking & Slicing. Color: Silver, Condition: Used. Listed at 59.99 USD. Pre-owned trainer in very good condition. Includes instructions and Trainer Template. Please see photos for a detailed description. The "Duffix" Swing Trainer Learn instantly to eliminate slicing and hooking problems! You have to ask yourself what happens when you hit the ball..Have you been slicing the ball, or hooking it out of play? How's your back swing? Has accuracy, distance and swing been a problem? This device works for right or left handers. According to information about this device it forces the club head to square on every swing, dramatically improving release... and you can watch the flight of the ball to prove it! You can tune up your golf swing before every round of golf.it builds "feel" and correct "muscle memory" which improves swing-tempo, accuracy and distance! This device attaches to any golf club!Makes golf fun again. "Feel" the power of knowing where the ball will go every time! How it worksClamp your Duffix to the golf club just below the grip.Rotate to desired "clock" position (viewed from top of club).Then tighten until swing trainer does not move on shaft. Caution: Do not over-tighten on composite (e.g. boron-graphite) shafts.Special Tip: Rotate the Duffix to just off-center, right-handers "11:00" or left-handers "1:00" position and develop "muscle memory" for a gentle draw. Note: Because the Duffix is positioned above the balance point on the club shaft, the whole effect transfers to wrists and hands, with little or no weight transfer to club head as it meets the ball.