Gotoh GB707 4L Cosmo Black Tuning Machines for Bassguitars

Compact Bass Tuning Machines for 4-String Basses

The Gotoh GB707-4L Cosmo Black is a compact bass tuning machine from Gotoh's Regular series, sold individually for the left side of a 4-string bass headstock. Built as a direct replacement for worn stock tuners, it pairs a 1:20 gear ratio with a Rock-Solid post and Lubri-Coat gears for smooth, accurate tuning. Each tuner weighs 60.2 g and includes all mounting hardware.

What to Check Before Installing

When swapping bass tuners, gear ratio, post stability, and hole compatibility matter most. This model requires a 9/16" (14.29 mm) mounting hole, fits headstocks up to 15.25 mm thick, and needs a minimum 33.6 mm hole spacing. The Cosmo Black finish blends with black hardware on most modern bass headstocks, and the compact footprint suits both Fender-style and import bass designs.