Do not worry about the ability to turn the wheels at a standstill. You don't race at a standstill. Worry about when the truck is rolling slowly. Using a servo saver that is too tight will eventually kill the servo. That being said, you should be able to move the wheels some, but not full lock to lock. If you can go lock to lock and you are on a fairly high traction surface, you need to loosen it a little.