Newb question on jazz bass truss rod

[Holdsg]

agree

 

[skycruiser]

It's not a standard size washer. It needs to be 0.365" OD x 0.190" ID x 0.100" thick. Some of the guitar supply places sell them. Some folks have taken #8 steel washers and drilled out the hole to 3/16". When I need one for a Fender truss rod repair job, I machine it up from brass.

The important thing to understand is that your neck has already been damaged. The reason the truss rod ran out of threads is that it has already been overtightened enough that it crushed the wood inside the neck. The anchor end of the rod, back near the nut, has been crushed forward about 1/4". The whole rod has moved that far toward the heel. That's why it ran out of threads. And that still wasn't enough force to flatten the neck.

So now, if you put a washer behind the truss rod nut, the nut will be spaced back, and you'll have a few more threads available. But it won't be any stronger or be able to apply more force than before. Even if you physically bend the neck backward while tightening it. It will probably continue crushing the wood around the anchor, like it was before. And the neck may not get any straighter than it is now.

That's why I recommend that you address the real problem: The neck is warped and needs to be straightened out. Then you can put a washer under the truss rod nut and it should work okay.

Here's a pic I posted elsewhere showing how the wood can be crushed due to overtightening (or soft wood?)

 

[96tbird]

Here's a pic I posted elsewhere showing how the wood can be crushed due to overtightening (or soft wood?)
View attachment 7198861

Perfect ammo to support the practice of flexing your neck when TIGHTENING the trussrod. I'm looking at you, naysayers.

 

[Holdsg]

update.

Quartersawn neck from Warmoth installed and everthing seems to be hunky dory now. Just an expensive lesson I hope never to have to repeat.