Originally Posted by Ken Fitzgerald
Mark.....You'd leave the bowl on the chuck...Unscrew the chuck....screw this adapter into the chuck....Place outer ring of your donut chuck over the bowl......put the entire assembly in the tailstock...mount the base of the donut chuck (on you faceplate) on the headstock.....bolt the outer ring of the donut chuck to the base and you have your bowl centered and captured..
In short it would center your bowl on the donut chuck by leaving the bowl attached to your chuck until captured by the donut chuck....I hope this makes sense.