The patented G&L Dual-Fulcrum® vibrato uses two pivoting points rather than the six wood screws attaching the a vintage type tremolo. Leo Fender created this design to yield a much smoother, "silky" feel and allows the player to bend notes up as well as down. Unlike silmilar looking copies, the DF vibrato uses a hardened steel bridge plate, pivoting on knife-edge bolts set into massive brass inserts anchored into the body. The bolts themselves are machined from billets of cold rolled steel, then heat treated for hardness and finally plated.  The handling of the vibrato is improved with the addition of a machined aluminum tremolo arm that uses a single locking Allen screw, pressing a nylon insert to allow quick installation and removal, smooth feel, and also allow the player adjust the amount of resistance on the arm. Further, Leo designed the string saddles to improve intonation and reduce string breakage.