[leswatts]

Yeah annealing, inserts, grinding off case and even hard machining all work.
The really interesting part is workholding. On some screws, particularly rolled ones,
the outer lands have a burr from the rolling process. They are not accurate datums for the raceways, so holding in a chuck or collet can create big errors. If possible, I check the lands with an indicator on the carriage with it set for threading at the ballscrew pitch. Then shim and adjust as needed. Someone else might have a better way...