Where the feck do people get their ideas? Frank Ford's site is very good. His advice is mostly excellent. That said, if you are even a tiny bit uncertain then don't touch the truss rod. Just take it into the shop and let a pro do it. On my £100 Chinese acoustic I tweak the rod with confidence as and when I need to (which is actually hardly ever). On a Martin I would be very careful and a little nervous. Take it to a decent guitar tech. The adjustment, if it is just the rod, will be quick and cheap - and if done by a pro it will also be safe.
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