Grover 18:1 Rotomatics 3 On A Side Nickel. The original Rotomatic with an improved higher ratio gearing. The 18:1 ratio provides for finer tuning and greater stability. The finer gears provide smoother tuning and a higher degree of backlash elimination. This new version of the Rotomatic uses the exact housing as the original. Only the gearing has changed. Includes washers, bushing and wood screws. (102-18N)