and Montgomery were appearing in Fender's advertising. By the end of the 1950s the "P-Bass", as it would later be called, was finally gaining acceptance with rock 'n roll and country bassists, and also with guitarists who would double on the instrument. The most notable of the latter was Carol Kaye, originally a jazz guitarist, who as a bassist became best known for her work as part of the consortium of L.A. session musicians known as The Wrecking Crew. Design alterations and variants The original Precision Bass of 1951 shared several of its design features with the six-string Telecaster guitar, the main difference being its double cutaway body. The 1954 release of the Stratocaster with its contoured edges for comfort, was inspired by the Precision bass, which in kind, also received the same style body contours. In 1957 the headstock and pickguard were redesigned to resemble the Stratocaster, with a rounder neck heel replacing the original square shape. A redesigned pickguard was made of a single layer of gold-anodized aluminium with 10 screw holes. At the same time the original single-coil pickup was replaced by the "split-coil" design with staggered pole pieces which is now known as the typical Precision pickup. Its two coils are typically connected in a humbucking mode, a feature that was not emphasized by Fender at the time, as Seth Lover's patent on the humbucking pickup had not yet expired. In 1959 a glued-on rosewood fingerboard featuring "clay"-style dot position markers replaced the 1-piece maple neck and remained standard until 1966/67, when the CBS-owned Fender companies began to offer a separate, laminated maple fingerboard capped on a maple neck. Rosewood fingerboards were then made of a veneered, round-laminated piece of wood and pearloid dot markers replaced the "clay"-style inlays introduced in 1959. In 1960 the aluminum pickguard was replaced with a 13-screw celluloid design having 3 or 4 layers of black, white, white pearloid or with a brown "tortoise-shell" pattern). In the same year the newly designed Fender Jazz Bass was released. The original Telecaster-derived design, with a few updates, was reintroduced in 1968 as the Fender Telecaster Bass. Within a few years, this evolved into a model distinctly different from the contemporary Precision Bass, alongside which it was marketed through 1979. Two artist-designed models use the Telecaster Bass body style; the Mike Dirnt Precision Bass, using today's standard single split-coil pick-up, and the Sting Precision