Bullet Guitar Jack Tightener. The patent pending Bullet guitar jack tightener is a must-have accessory for every guitar player. The patented Grip-Tip holds the jack while tightening, preventing damage to wiring and solder joints. Similar products require additional wrenches or tools to work, and are made of metal which can scratch and damage your hardware and finish. The Bullet has everything you need in a quality plastic tool that fits in the palm of your hand. With the Bullet at your disposal, you'll never take your jack plate off again to tighten things up.