One half inch thick quarter sawn hard rock maple is the material used for bridge caps. Because the cap and the bridge body are made from a very hard wood, it is very important that the joining surfaces mate perfectly. I use a combination of thickness planer, joiner, sanding block and scraper to achieve this perfect mating. It is a bit tedious, but it is possible. Once this is accomplished, the cap and body are joined with a special glue (Bolduc acoustic wood glue) and clamped with about 200 psi pressure. After drying overnight, the over hanging wood stock is removed with a spiral trimming router bit in my router table. The result is a tight joint, and nicely planed side, and a bridge that is ready to be planed to the proper height when setting the bearing.
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