Which of the following is NOT a method to sag a conductor?

When determining methods for sagging a conductor, it's important to understand the purpose and functionality of each approach. The correct answer identifies a level tool as not being a method for sagging a conductor. This is because a level tool is primarily used to ensure that surfaces are horizontal or vertical, which does not directly relate to measuring or adjusting the sag of a conductor.

On the other hand, a dynamometer is a device used to measure the tension in the conductor, providing critical information that can assist in achieving the desired sag. Timing mechanical waves with a unisagwatch can help assess the sag by measuring how long it takes a wave to travel the length of the conductor, which can be a factor in calculating the sag accurately. A transit is an instrument that can be used for surveying and obtaining precise measurements, which can also aid in determining the correct sag for a conductor by providing directional and elevation information.

Thus, while all the other methods provide specific means to measure or calculate sag, the level tool lacks the functionality necessary for this particular task, confirming it as the correct answer.