Anglepoise
Flashlight Enthusiast
Internal threading is always going to be a tricky. That combination of a nice fitting thread and disengaging the half nuts. Well we have all been there. Your idea of reversing the lathe and threading from inside out has merit and will improve thread finish and lower your heart rate. How is your chuck attached to the lathe spindle? If it is threaded, then you need to be aware that it could unscrew itself and crash. Internal threading to a shoulder sorts the men from the boys and you are on the right track.