A non-adjustable neck-reinforcement is still a truss-rod. Fyldes have a truss-rod regardless of age - some are adjustable, some are non-adjustable, some may be steel, some may be other materials, but all are truss-rods.

That is the point of my original post of 03 Jul 25 - 04:09 PM, which The Sandman appears to have missed. Hopefully all is understood now.

Now back to the thread topic - strings for DADGAD tuning.