A professional who assists hot-top liner in lining covers (hot-tops) for ingot molds. Responsibilities include:

• Pries and chips firebrick, mortar, and clay from inside of cover, using tools, such as crowbar or chipping hammer.
• Attaches crane hooks to lugs of cover.
• Cleans mold with oxygen lance.
• Mixes mortar and carries firebrick to repair platform.
• May signal crane operator to lift and position covers.
• Performs other duties as described under helper master title.