Tuning keys are necessary to play a guitar. However, they can sometimes break, especially on old or used guitars. This makes playing the guitar significantly more difficult or, in some cases, impossible. Our guide will help repair tuning keys and keep guitars out of the trash. Specifically, this guide helps repair and replace tuning keys on an SR 306-12951100 Acoustic Guitar. We will be replacing the old tuning keys with 3x3 plate tuning keys.