Jack was a professional guitarist whose career intersected with his mentor-collaborator and lifelong friend, Merle Travis.
Jack played a vintage Martin double aught acoustic guitar throughout most of his career. Being a working pro, every several years, he would send his instrument back to Martin to have it maintained. Jack was always concerned about the guitar top warping. Regardless of who made them, regardless of how expensive they were, acoustic guitars were very likely to experience warping of the top and neck.
Jack reasoned that guitars warped because of the way they were made. The relentless pressure the strings exert over the top of the acoustic instrument compels the guitar maker to reinforce the tops with sound-robbing support.
Years earlier, Merle Travis had designed a new shape of electric guitar that would become the Fender Broadcaster. Inspired by his friend’s innovation, Jack engineered a simpler, more elegant way to reduce acoustic guitar warping. This was the birth of the Stress-a-Way Bridge. Rather than using sound-robbing reinforcement to reduce warping, this watershed innovation to the shape of the guitar bridge effectively disperses the stress evenly over the top of the instrument.