Sometimes you just don't have the right size clamp for clamping odd-shaped projects such as ring bowls and vases.
joinery shop tip

Use your drill press. Center the workpiece on your drill-press table. Apply pressure with the quill, using a scrap piece of wood in between to protect the project. Then lock the quill in position. This works well when ordinary clamps aren't deep enough to fit.
—F.F. Kuhn, Cedarcreek, Mo.