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Great news, I didn't know the hex fitting was an insert. One other suggestion to avoid another bad day. Consider reinforcing your tenon if you use the barrel nut attachment system. I did some failure testing on that system a while back and it did not take much force to cause failure in tension. With reinforcing I could not cause a failure in the reinforced area..



Here's the thread where it was discussed

http://luthiersforum.com/forum/viewtopi ... no#p413582

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It's not what you don't know that hurts you, it's what you do know that's wrong.

Thanks Terrence. I have thought about re-enforcing my tenon and I think you've talked me into it. Fortunately, I haven't yet had any tenon failures.

Pat

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There are three kinds of people:

Those that make things happen,
those that watch things happen,
and those that wondered what happened.

Hey Pat
Are you saying that it looks like the hex is screwed into a coupler on the threaded shaft?
Your picture with the neck off makes it look like the nut is still full length.

Tim

I'd be going with the locktite permanent (though I suspect even CA would do the job)
JB weld is a bit too thick IMHO for this application

Tim,

The nut is indeed still full length. The hex was an insert into the nut. I don't anticipate finding an insert too easily so my plan was just to use a 10-32 with a hex socket head. If I do find a 10-32 hex insert, I'll use that.

Pat

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There are three kinds of people:

Those that make things happen,
those that watch things happen,
and those that wondered what happened.

My Allied rods which I looked at a few days ago had no insert in the adjuster, the hex was just formed in the end.
The adjuster was quite a small diameter with thin walls, you could never have fitted an insert in.
But these were bought about 7 years ago, so it seems that the design has been changed.

It's been a while since I have seen an Allied rod too, but I have never seen a truss rod that was made that way.

No, ideal welds are often weaker than the parent metal. Silver soldering doesn't change that. A "programmable automatic furnace with a conveyor belt feed" might yield an improvement on most of the rods that are offered for sale, but that's a low bar. Hiring a skilled welder would fix most of the problems. Some design tweeks, and process control would help too.

I have a number of the Allied rods in the shop .. from what I can tell the end they put on that rod never had the hex part pressed - I don't think its an insert at all, it looks more like its stamped in to the rod, then the other end is threaded (or vice versa) ,, anyway, looks like you have a solution once you get a hex end screw ...

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Tony Karol
www.karol-guitars.com
"let my passion .. fulfill yours"

I had a response from Grant at Allied Lutherie and, although he wasn't sure, he suggested that the hex part is cast into threads. Seems reasonable enough to me. He also said my problem was "bizarre" and hadn't seen that before. He also offered me a new truss rod which I will be happy to take him up on as I'm in need of another batch of rods anyways and I still like the rods from Allied.

For those who might be interested, here is a picture of how it worked out in the end:


I also did find a 10-32 set screw but I liked the screw with the head better since it takes a larger, more robust size wrench. I ended up going with the red Loctite. The screw is 3/8" long, i.e. lots of thread and I've given it some healthy cranks in both directions and it seems solid. The neck is now back on the guitar.

Cheers,
Pat

_________________
There are three kinds of people:

Those that make things happen,
those that watch things happen,
and those that wondered what happened.

Glad it worked out for you Pat

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the weld isn't as much the issue as the change in the metal temper.

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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

The ends are threaded, and then broached for the Allen wrench. Looks like yours missed that last critical step.

Good fix Pat. That may last you longer than the original.

Thanks Tim and I think you might be right. The hex head on that screw has a lot more meat to it than the hex casting or broaching or whatever it was. If the loctite holds, then I'd call this an upgrade.

Pat

_________________
There are three kinds of people:

Those that make things happen,
those that watch things happen,
and those that wondered what happened.