JLD Bridge Doctor, Screw Mount, for Flattening Bulging Guitar Soundboards A unique solution to a common bridge problem, this spruce device attaches beneath a guitar bridge An adjustable spruce "pressure post" rests against the tailblock, providing leverage to flatten the soundboard Better bridge contact and alignment can also enhance sound projection This screw-mount version attaches beneath the bridge via an inlaid screw (this requires a hole to be drilled through the bridge behind the pin holes) Installation instructions included