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Another observation if I may - there are obviously lots of different ways of doing things, but the way I'd do this would be to leave the material on the parent stock for as long as possible. So rather than parting off your 4 lengths, I'd face the end of the bar, turn the intermediate diameter to the right distance from the end of bar, turn the thread diameter to the right distance from the end of the bar, put the thread on, part off to correct length. Do this for all 4, then put them back in the chuck the other way around to drill and tap one by one.