The act of preventing the movement of a ZR tremolo system, rendering it fixed or hardtail, is a modification often undertaken by guitarists. This alteration eliminates the tremolo’s ability to raise or lower pitch, effectively locking it in a static position. An example would involve inserting a wood block or similar material into the tremolo cavity to restrict its range of motion.
Fixing a ZR tremolo offers several advantages. It enhances tuning stability, as unintentional tremolo use is no longer a factor. Sustain may also improve due to increased contact between the bridge and the guitar body. Historically, this type of modification was common among players who preferred the feel and response of a hardtail guitar but owned an instrument equipped with a tremolo system.
