An employee demonstrating the proper technique of operating a switch lever will NEVER:

Pushing down with full force, jerking on the switch lever, or looking away while operating all represent unsafe practices when handling switch levers. The proper technique emphasizes smooth, controlled movements, ensuring the switch is engaged correctly without risking potential damage or accidents.

When operating a switch lever, it's crucial to maintain focus and control to avoid unintended movements that could lead to misalignment or operational failures. Jerking on the lever can cause a hard impact on the mechanism, increasing wear and tear or potentially jamming the switch.

In contrast, ensuring that the lever is locked in place is essential for safe operation. This confirms that the switch is correctly aligned before a train passes, preventing derailments and accidents. Thus, this technique exemplifies proper safety precautions in this operational context.