@stewblack If you do decide to give up on doing it yourself (but I hope you do sort it on your own), there are a couple of fine folk in the FB fakers group who may be able to work wonders on it.
It's a £500+ instrument (when in working order).
I'm not sure if you already know this, but the Ric 4001 basses' truss-rods will collapse if you just tighten them as you would a Fender or most other guitars, as the stop block at the end under the nut folds in on itself; the result is the fingerboard separates from the neck.
Yours looks like it might've possibly been the result of over-tightening, though it is a different design.
Incidentally, the 4001's truss-rod system isn't necessarily a bad design, provided you follow the instructions and flex the neck to position and then turn the adjuster to hold it in place; the issue is assuming it works like other guitars, when there weren't may brands around in the 1950s...