I start bowls and boxes between centers. Rather than removing my chuck I slip my drive centers or starter plate into the chuck and mount the blank. The second photo is my Robust slip drive center modified to put teeth in it. The third is my starter plate for starting bowls. I drill two holes into the bark of a natural edge blank 2 7/8" apart. They act as imbedded pins to rotate the blank.
IMG_3217.jpg IMG_3219.jpg IMG_3220.jpg