??? male hex nut ??? I don't believe I've ever seen that before on a Fender. I know that Gibson uses a truss rod nut that needs a socket to adjust. Every fender style truss rod nut I've ever seen used a hex wrench/Allen key. It can be tricky to get down in there. The short end of a standard hex key should be long enough to reach. Or a really long T-handle style although they can be tricky to find in the right size and be long enough to get down past the tuners.
can you take any pictures and post them here?
I found a video about a broken truss rod nut and as you can see, it was quite a procedure to get it fixed
https://www.youtube.com/watch?v=jNb-HUCjOcA
good luck and let us know how it turns out.