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you thread left-to-right (away from the chuck) for left-handed threads
You can do it for RH threads too by reversing the spindle and inverting the tool. It's not a bad way to do any thread which is open at the tailstock end, but for the part in question I'd consider it pretty much essential on a manual lathe, since you can't afford to lose thread length by creating a decent relief against the shoulder.
gbj_tester
fizzy.bleach
you thread left-to-right (away from the chuck) for left-handed threads
the tool keeps going on thread cutting operations because you have to auto-feed it, so it keeps going until you disengage the half-nut that binds it to the lead screw.