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A
Reach in while the machine is still running
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B
Ensure the equipment is properly stopped/locked out as you were trained before reaching in, so the machine cannot start while your hands are inside
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C
Have a coworker hold the parts still
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D
Clear it quickly before anyone notices
Why this is the answer
Reaching into running or unsecured machinery is one of the most serious hazards in a processing facility. The best practice is to make sure the equipment is properly stopped and secured (following lockout or equivalent trained procedures) before reaching inside, so it cannot start while your hands are in it. Reaching into a running machine, relying on a coworker to hold moving parts, or rushing to clear a jam unsafely can cause severe injuries. The VEA rewards a strict safety-first approach to equipment, and following proper stop/secure procedures before servicing a machine is exactly that.
Source: USPS 476 VEA — Equipment Safety Procedures