This video shows how to collar a cylinder. The collar of a cylinder is a plate or ring used under the head of the cylinder for a lock. Put the clay on the spinner. Mold the clay while spinning the spinner. Mold it first to the shape you want. Tighten the neck of the vase that you are molding. By tightening the neck of the vase, you are now shaping the collar of the vase. Shape it to the size and design you want. Enjoy making your own vase with the color you want.