Another early maker and user of the Pull-String was Bob Warford, a friend and Kentucky Colonels bandmate of White's who also played guitar with Linda Ronstadt and The Everly Brothers. Warford made his own Pull-String in early 1968 based on the Parsons/White design, with their consent, and installed it in his Telecaster. Later that year, Parsons and White licensed the StringBender to Leo Fender at Fender Musical Instruments Corporation. Fender revised the design to simplify mass production and developed a prototype. However, this model never went into production. Parsons and White subsequently licensed their design to Dave Evans, who had heard about the device and had been experimenting with his own models. Evans built and sold a version of the Pull-String from 1969 to 1973. His customers included Albert Lee, John Beland (guitarist for Linda Ronstadt) and Eagles guitarist Bernie Leadon, who played his Evans Pull-String on "Peaceful Easy Feeling".