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After bludgeoning my way through 2 x semi-successful classical guitars, I have decided to build a steel string - roughly based on the venerable Gibson 00 profile.
I have carved the neck and have inlayed the truss rod - but am at odds as to exactly where the end (of the nut) of the truss rod should end up.
It is an LMI double-action rod. There is an LMI/Robbie O'Brien video that details the install, but is vague when it comes to the actual termination point of the end of the truss rod - he moves the rod all over and comments to ensure the nut does not hang out into the headblock with the screws resting on the tenon.
There is no mention on where the end of the truss rod is to end up - flush with...the end of the tenon? The inside of the heeadblock?
Other research and books are just as vague - although the Cumpiano book seems to show the rod adjusting nut extending into the headblock...

Please confirm my assumption that for this rod:

The very end of the truss rod - the total length - the outside of the adjusting nut - should end up flush with the outside of the tenon, and neither be shorter, nor extend into the headblock.
The nut itself would be accessed by an access hole drilled through the headblock.

Like this:



Thanks for having a look!

Robbie_McD

Personally, I would put the end of the rod (not the nut) flush with the end of the tenon. And actually, you wouldn't want to put the nut in the channel at all as it will rise or fall when tightening the truss rod which will just lift that end and might cause separation of the neck and the fretboard, as the heal and tenon of the neck offer much more resistance to moving versus the thin fretboard.

Make sure the nut is outside of the tenon, and that there is an access hole or channel in the headblock. Also think about the braces on the top that can interfer with accessing the truss rod nut.

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