Check the listing for details. Rare Cuetrack Stroke Trainer - Training Aid for Pool, Billiards, Snooker. Condition: Used. Listed at 429.99 USD. This stroke trainer is one of the best devices that I have found for developing a perfectly straight stroke without any side-to-side movement. The tube slips over your cue and fits perfectly between the vertical prongs, which only allow forward and backward movement. These devices have been used by top instructors to teach players a proper stroke, but even expert players will benefit from using this to improve their stroke. By consistently training with this, you will develop the muscle memory to stroke perfectly straight, which very few players actually do. The base and prongs are made of high-quality metal, and the tube is plastic with a foam interior that protects the cue. Comes with a PDF of the original manual.