Open gear type machine heads are often considered inferior in both performance and durability compared to the “Rotomatic” type of sealed machine head. Some say that because the main section and bushing are separate, it has been difficult to center the post on the bushing hole, when attaching the assembly to the guitar. To solve this problem, the SE510 series is equipped with a self centering guide in the lower part of the main section, and in combination with the Rock solid string post any side-to-side movement is minimized. The improved performance and durability which the SE510 series provides, thanks to GOTOH’s unique construction, gives you the chance to experience the sound which never heard before.