Our Acoustic Guitar Bridge Template takes the guesswork out of making a bridge from scratch. Lays out bridge pin holes, too. Here's one of our favorite Dan Erlewine inspired tools! This brass multi-template is perfect for checking your progress when shaping a Martin-style "belly" bridge from scratch. The edges are contoured for matching the top arch, back roundover, and wing contours. StewMac's Todd Sams suggested the handy locating holes for bridge pin spacings, too: modern 2-1/8" and pre-war 2-5/16" spreads.