Martin actually recommends mediums for the 000 Authentics (but not the GE's), as they were built for mediums back then. I would assume the standard series 000s have different bracing and are designed around light strings, but whether it is actually "dangerous" to put mediums on one or merely Martin covering their backside is debateable. I have a prewar 000, and I much prefer mediums on it...I just tune it to Eb so that the tension on the top is within a few lbs of lights at concert pitch. You might try giving Elderly instruments a call as they have probably done more Martin repair work than anybody on the earth. One thing I would NOT bother doing is calling Martin customer service as this will be a huge waste of your time (been there, done that).
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