Which method is NOT used by dispensers to release their payloads?

Dispensers designed to release payloads utilize various methods to ensure the safe and efficient deployment of their contents. Gravity is one of the fundamental forces allowing payloads to drop naturally from the dispenser, while ram air is used in systems where airflow assists in the release of the payload, such as in parachute operations. Small explosive charges can also be employed to eject payloads quickly and safely, particularly when a rapid release is necessary.

On the other hand, manual pull, while it may imply human intervention, is not a standard or efficient method for the release of payloads from dispensers. The reliance on manual efforts raises concerns about reliability and safety, especially in critical operations where precise timing and automation are essential. Thus, it stands apart from the other established methods for payload release in dispensers.