A professional who tends machine that rounds edges of pearl button blanks and forms convex surface on back of blank. Responsibilities include:

• Places blanks face down in automatic chucks of feed mechanism that forces blanks against abrasive wheel shaped to produce convex surface.
• May tend convex-grinding machine to form studs on backs of buttons, or to shape button faces.
• May place single blank in chuck of manually controlled convexing machine and pull on leverage bar to force blank against abrasive wheel.