Good luck straightening one. It is an art to straighten a ball screw to a point where it does not wobble when being used.
To machine them you just need a carbide insert. You can cut past the hard surface without too much of a problem. I had the do the 1-1/2" diameter one on the Z axis of my mill. Hardened steel is not too big of a deal as long as you have a solid machine. Also cermet inserts work even better.
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