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Spinning the captive nut, while holding the brass knob is the coarse adjust. The captive nut is M6x1. Turning the knob and holding the nut is the fine adjust, with 0.2mm/turn. It goes backward from what I expected, but it does work. For some reason I needed some shims to get it to work, so I left them in place, otherwise it was a little tight to turn. The captive nut rests in a u channel. Don't know how I came up with the inspiration, but it just came to me. The first picture shows the custom nut I made to slide in the slot. This way I can set the lock from the top side of the tail stock instead of the bottom side. The second picture shows the original configuration. Mini-lathes sure do take a lot of liberties, and make easy adjustments hard...