What method is used to prevent further fraying of the line?

Whipping is a method used to prevent further fraying of a line by tightly wrapping the free end of the line with thread or twine. This creates a binding that holds the fibers together, significantly reducing the chance of unraveling or fraying that can occur over time, especially with natural fibers or some synthetic ropes. The whipped end is especially important in working lines or when the line is subjected to stress, as it helps maintain the integrity and functionality of the rope.

In comparison, chafing gear is typically used to protect lines from abrasion against surfaces but does not address the fraying that occurs at the ends of the line. A double harness refers to a method of attaching equipment or securing items, which does not directly relate to preserving the integrity of a line's end. Splicing, while a strong method to join two lines or create a loop, does not specifically prevent fraying; it is more concerned with connecting or enhancing the functionality of lines. Thus, whipping stands out as the most relevant method for addressing line fraying.