That's what I see anyway. On my favorite bass too.
I bought a Highway One P Bass in 05, love it. Great weight, neck feel, tone, everything. The shop I bought it from offers a free setup when you buy any guitar from them, so I had them set up the action lower and tighten some things here and there, nothing major. That was in 05.
I've recently taken a liking to flatwounds, so I decided to throw a set on my P Bass. I noticed that when I put them on, there was too much relief in the neck and I was getting some super high action (or more than I'm normally used to) so I grabbed my hex wrench and went for the truss rod. After closer examination with a flashlight (it's deep in by the headstock) it's totally stripped! Like completely rounded off instead of 6 sides.
I foresee no possibly way of getting this neck back to the way it was. Any suggestions? I could keep it the way it is but it's higher than I like and just annoying to play now in general.