The bridge must be fitted to the curvature of the soundboard.  Place a strip of adhesive backed sandpaper on the soundboard at the position of the bridge.  Rub the bridge blank back and forth on the sandpaper until the bottom of the blank matches the curvature of the soundboard.

After fitting the blank to the soundboard, the blank can then be shaped and decorated to your prefered shape and level of decoration.  The string height is checked and the saddle is sanded to the correct height and then the saddle is notched to accept the strings.