What technique enhances the security of a clove hitch when used for a temporary fastening?

Using a half hitch enhances the security of a clove hitch when utilized for temporary fastening. A clove hitch by itself can slip under certain conditions, especially if the load shifts or the line is not taut. However, tying a half hitch tightly around the standing part of the line gives additional friction and security, helping to hold the clove hitch in place more effectively. This added knot prevents the clove hitch from loosening, making it more reliable for securing items temporarily.

The other options, while they may provide some degree of utility, do not directly contribute to the inherent security of the clove hitch in the same way. Adding a round turn can create more friction but may not be practical for a temporary fastening situation. Tying it with one hand could hinder the ability to apply sufficient tension or precision to secure the knot effectively. Doubling the line may give additional strength but doesn't enhance the gripping characteristics of the clove hitch itself. Therefore, using a half hitch is the most effective technique to improve the security of a clove hitch in such scenarios.