How are the jaws of a chain puller opened and closed?

The correct method for opening and closing the jaws of a chain puller involves using a dial located on the top of the tool. This design allows for precise adjustment of the jaw position, enabling the operator to easily grip and release the chain as needed. The dial mechanism provides better control for tightening or loosening the chains, ensuring that the user can efficiently manage the tool while applying the necessary force.

In contrast, options such as a lever on the side, a button on the handle, or a foot pedal do not typically offer the same level of precision or control in adjusting the jaws of a chain puller. These mechanisms may be found on other tools but are not standard for the operation of chain pullers specifically, which prioritize a dial for effective engagement and disengagement of the device.