Classical ukulele opengear tuning pegs with 2R machine heads and knobs for 4string instruments Description These opengear tuning pegs are designed for classical ukuleles and other 4string instruments. They provide a straightforward replacement or upgrade option when original tuners wear out, stick, or fail to hold pitch. The open machine head layout makes visual inspection and maintenance easy while delivering reliable tuning control. Key benefits Reliable tuning control for 4string instruments: Designed to serve as direct replacements for worn or broken tuners on classical ukuleles and compatible 4string guitars. Opengear design for easy maintenance: Exposed gears allow quick lubrication and visual checks, helping extend service life and maintain smooth operation. Simple installation: Fits standard ukulele peg configurations and mounts with common tools, making repairs fast for hobbyists and pros alike. Clear, tactile adjustment: Knobs provide comfortable grip and accurate tuning adjustments during setup and performance. Important attributes Function: Replacement or upgrade tuning pegs and machine heads for 4string instruments. Compatibility: Classical ukuleles and other 4string guitars or instruments with matching peg hole spacing and mounting screw positions. Gear type: Open machine heads for visible gear mechanism and maintenance access. Configuration: Includes tuning peg components plus 2R machine heads and knobs as described for 4string setups. Size and fit: Intended for standard ukulele peg holes and classical headstock layouts. Verify existing hole diameter and screw placement before installation. Performance: Smooth turning action and precise pitch adjustment when installed correctly. What this product solves Replaces damaged or slipping tuners to restore tuning stability. Upgrades older sealed tuners to an opengear setup for easier maintenance. Provides spare parts for instrument , custom builds, or restorations. Use scenarios 1) Repairing a vintage classical ukulele: a broken tuner to restore full playing functionality without modifying the headstock. 2) Workshop maintenance for gigging musicians: Keep a set of machine heads on hand to quickly swap out faulty tuners between shows. 3) Building or customizing a 4string instrument: Install opengear tuners during assembly for straightforward access to gears and future lubrication. Installation tips Confirm peg hole diameter and screw hole alignment before . Use appropriate small screwdrivers and hand tools for secure mounting. Lightly lubricate exposed gear teeth after installation for smoother operation and longer life. What to check before buying Verify compatibility with your instrument headstock dimensions and screw hole spacing. Ensure you have the correct number and orientation of tuners for your 4string layout. This product offers a practical, serviceable option for anyone needing to or upgrade tuners on classical ukuleles and similar 4string instruments.