Helps lower the ball stud, and centers it at 16.5mm and is 5mm thick to help with turnbuckle angle. Used with a 5mm ballstud, anything longer and you'll have to drill out the the Hudy saver for clearance.  If you are running the Awesomatix Single Bellcrank in the forward position,  you can always add a 1mm shim for the proper angle. Servo saver and ball stud not included.