Between the taper, the thinness of the step down, and the soft wood, I did not think to even try a chuck. On a hardwood blank, I might need new jaws for my chuck for those diameters. I don’t own any bowl turning jaws. If I needed to make bunches of thin disc-like objects I would be looking for a better setup. I turned these lids with the worse side of the blank (surface cracks, bad splinters, thick black weathering) screwed to a faceplate. There was so much waste built into the blanks that I didn’t mind throwing a lot of ‘wood’ (speaking loosely) into the burn box. Incidentally, some of the black crust on the outer surfaces smelled pretty weird when I was taking it down. I was glad to be turning outside to avoid breathing any of the dust.