Final answer:
The part of the original Tsar Bell in Moscow that required 24 men to move is the clapper.
Step-by-step explanation:
The original Tsar Bell in Moscow, cast around 1600, was an enormous structure and weighed almost 40,000 pounds. It required the strength of 24 men to move what is known as the clapper. The clapper is the part of a bell that swings on the inside to strike the sides and produce the ringing sound. In this instance, the clapper was so heavy that extensive manpower was necessary to manipulate it within the bell's structure.