Nonetheless, a gift of a unit to Van Halen by Floyd Rose himself gave the unit instant overnight success and credibility. Still more stability was provided by the addition of a second lock on the bridge nut, making a "double locking" tremolo system that was more complex to set up. The double locking design is sometimes called a "two-point locking tremolo", inviting confusion with the Fender "two-point synchronized tremolo", which is a different concept and not a locking tremolo at all.