Official Luthiers Forum!

I got a Martin DM in for repair and I need to adjust the truss rod. Frank Ford's site shows a picture of what looks like a DM and says it takes a 5MM allen wrench. That doesn't work and from what I see it looks like a small nut on a threaded rod. A 1/4" nut driver is too big and I don't have anything smaller that is long enough to go in the slot. Could I be looking at a broken off Allen head? It's a little hard to see in there.

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Ken Franklin
clumsy yet persistent
https://www.kenfranklinukulele.com

what year ? They changed the rod in about 2008 but it is 5mm after than 1/4 in before.
If you see a nut that ain't a Martin. Martin always used a barrel nut.
Post a pic

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

Thanks for the info about the barrel nut, John. After getting some better lighting and a little bit of thought I realized that there wasn't any barrel nut at all. Luckily I had one for the rods I sometimes make and it fit fine.

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Ken Franklin
clumsy yet persistent
https://www.kenfranklinukulele.com

the old 1 way rod is right behind the brace above the soundhole. On the new 2 way it is was back into the neck block. That is also a barrel nut but very hard to see. It is about 1/4 out of the neck and way in the neck block

_________________
John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it