Please teach, homemade wood lathe, how to make your own chuck, grab the clamping jaws

Find a round board (iron is better), draw a cross, cross the center of the hole screwed on a 10 mm screw; screw outside the set of a tube; to set tight; cross every 2 cm to play some 4 mm holes; the workpiece attached to the board; from the back of the board with a screw from the small holes through the board screwed into the workpiece is fixed. Then you can process it.