The Topaz & Weston Difference, Where Art Meets Engineering. The New Standard of Professional Lutherie. A great guitar is a living, breathing instrument. It requires more than just a “tune-up”—it requires a master’s touch and a scientist’s precision. At Topaz & Weston Instruments, we’ve combined two lifetimes of world-class expertise to ensure your instrument plays better than the day it was born. The Topaz & Weston Difference 1. The Plek Revolution We are one of the few shops in the world where the person operating the Plek machine has ten years of experience in it’s ownership and operation. Our Plek Station scans your neck under real string tension, leveling frets to an accuracy of .0002 inches. It is mathematical perfection for your fretboard.