Mark Babin is the guy, located in Hampshire, Il, a far NW suburb of Chicago. If you go on the Martin website, you will see he IS the factory authorized tech in the Chicago area. The guy is a master repair person. He has a shop in his basement and is the guy many stores in the area, including Guitar Center farm their stuff out to.

He is excellent on bridge repairs, caving-in tops, and neck sets. Fair and honest. Ask Jim Craig of Hogeye. He knows him.