For a dressing, I would trust it to any authorized Martin Warranty and Repair center. (I just had one done recently myself.)

This shouldn't require a trip to Nazareth, unless there are no respected luthiers in your neck of the woods....but there's got to be.

....so what have you got?.....I'm always interested in discussions pertaining to old Martins. It's the ''guitar nerd'' in me. 8-)