JLD is the maker of the Bridge Doctor, a patented device that corrects or eliminates bowed soundboards in guitars. The Bridge Doctor is installed inside the guitar and flattens out the soundboard with a lever mechanism that is completely hidden after installation.
The JLD Bridge Doctor models include a Screw Mount version that attaches with a screw through the bridge, and Brass Pin Mount models that use custom brass pins that replace your existing string pegs. The Brass Pin Mount models are available plain or with a variety of different inlays to match your guitar.