How are the middle shaft and end shaft of the expandable baton secured?

The middle shaft and end shaft of an expandable baton are secured with friction. This means that when the baton is fully extended, the design of the shafts allows them to lock into place through a friction fit. As the baton is extended, the components are pressed together tightly enough to hold under the pressure of use, ensuring that it does not collapse while being used. This friction-based locking mechanism provides a quick and effective method to secure the baton in its open position, allowing for reliable deployment in various situations.

The other options do not apply to the way expandable batons function. Locking pins would imply a mechanism that requires manual engagement and disengagement, which is not typical for most expandable batons. Adhesive would not be suitable for a device that needs to be extendable and retractable, while magnetism does not play a role in securing the shafts of a baton. Therefore, the friction method is both practical and effective for this type of self-defense tool.