sentences:  The Edge offers a number of improvements from the Original Floyd Rose, namely locking studs (for improved tuning stability, added in 1987-8), a spring retainer on the tremolo block (again, added in 1987-8) and a pop-in arm.A non-locking version, Edge II, appeared on the Vinnie Moore signature guitar in 1989.The guitar employed a low-friction nut and locking tuners.