What we were taught in school. for highly accurate work between centers put a piece of scrap in the chuck and turn a 60 deg point on it. Then just run the lathe dog against one of the jaws on the chuck. It is highly accurate since you are turning a point concentric with the rotaion of the chuck. If doing threads, and you need to remove the work from the centers to check something mark the jaw the you are running up against with a sharpie, other wise you will end up cutting a double start thread or triple start.
JP


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......... I was hoping to get a face plate, centres , 4 jaw chuck and steady



