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What is the primary function of a plug follower?

  1. To cut the key

  2. To retain springs and top pins

  3. To reassemble the lock

  4. To lubricate the cylinder

The correct answer is: To retain springs and top pins

The primary function of a plug follower is to retain springs and top pins. When a locksmith is disassembling or reassembling a lock cylinder, the plug follower is used to keep the springs and the top pins in place, preventing them from falling out when the cylinder is partially disassembled. This allows for the removal of the plug while ensuring that the internal mechanisms of the lock remain organized and intact. The other functions listed in the choices do not accurately reflect the primary purpose of a plug follower. Cutting a key and lubricating a cylinder involve entirely different tools and techniques. Reassembling the lock could involve several components and tools, but the specific role of the plug follower pertains to the retention of springs and top pins during disassembly or reassembly of the lock cylinder.