Which method other than a shrinking hammer can be used for metal shrinking?

• A. Prying with a crowbar
• B. Tapping with a regular hammer
• C. Cold working with a file
• D. Heat shrinking methods

Answer: (D)

Heat shrinking methods use localized heating to soften the metal so it can contract as it cools, pulling a raised area back toward the surrounding surface. By heating the high spot with a torch to a controlled temperature and then allowing it to cool, the heated region shrinks and the bulge reduces. This approach provides precise control and is useful when a shrinking hammer can’t access the area or would risk overworking the metal.

Prying with a crowbar tends to stretch or deform the metal further rather than shrink it. Tapping with a regular hammer can flatten or distort the surrounding area without achieving true shrinking. Cold working with a file hardens and reshapes through material removal or deformation, not through the controlled contraction that heat shrinking achieves.