Jazz neck won't bow either way, even with the trussrod nut removed

[DJJazzV]

Here's an update, and my solution to a problem that never really existed.

The neck on my '76 Jazz is now perfect. There was never anything wrong with it. It was just very stubborn to move.
Fix cost: $6
Tools: Allen wrench, 1/8" drill bit, the cut off end of a low B string.

I didn't like the idea of a washer spacer on the truss rod because that left less threads for the nut to grab, and I wasn't convinced that the bullet nut was maxed out.
Simple idea that took a while to come up with: I bought a new Fender bullet truss rod nut for $6 and drilled out the space between the hex top and threads. Drilled from the top, of course. Now I could see through it.

Since the neck was very stubborn to move, I had to remove it from the body and manually bend it back while putting the new truss rod nut on. I removed that washer spacer I previously had as well. Back to stock. As soon as it got snug, I wan't to see how much thread was left in the nut, if any. I took the cut B string end and put it through the top of the nut (the string core). I could feel that there was plenty of threads left on the nut. About 1/8". Knowing it wasn't maxed, I was able to manually bend the neck back again, and tighten more. Never "forcing it", a couple of 1/4 turns at a time, over a few days, and it turned out perfect. I ruined a set of strings in the process because I was constantly checking the action. Certainly no big deal there.

The neck is now unaltered, except for the new Fender truss rod nut, and I know I still have a little more than 1/16" of thread left, if I ever need it.

Thank you all again for your responses, and I hope the process I just shared helps some others. Knowing that the nut still had threads left to be used, and doing the neck work without strings or the body were key to setting up the stubborn neck.
Cheers!

[Turnaround]

Just to clear up something that may be misunderstood here. On a single action truss rod, the rod itself is not supposed to move, i.e. rotate. It is fixed. The nut tightens along the fixed truss rod applying pressure to the wood surrounding the end of the trussrod (or the washer that's there if there is one. This straightens the neck.

[garedot]

Hi all, i just found this tread about truss rod problem, i found that i have a different problem. My bass is still with a bow even when i took off the truss rod nut. I found this Jazz Bass in a old town, when i got it, previous old owner left it in the case under a bed in a room with humidity with the strings on it with tension, never played it again, too many years with the strings with tension, I think this was the problem, and now neck is bow event without strings.
So i found an article that says i need to take of the nut from the truss rod and seat neck with some heavy pressure on it right in the oposite direction with a lap directly to warm the neck, so right now i am in the process to do it, now is the second night with the heavy thing over it, i needed to improvise because i dont have room to work freely in my house, i am glad to try to get back this beatuful intrument to the road.

Please find the picture of how it looks like right now

[maturanesa]

0 bow is almost impossible.... If you press fret 1 and fret 15 for example you always get a gap between the string and the frets