"Petillo's triangular frets result in more precise intonation; however, not all guitarists are comfortable with their rigid feel.The Revolutionary Drumstick Patent of Petillo was sold to Ambico at the NAMM Convention in GA, 1977

In 1970, Dennis Berardi and Gary Kramer asked Phil Petillo Master Luthier-Engineer to design and build 4 prototypes of a new neck made out of aluminum and wood.