Concept:
Plough adjustment is important for proper depth, width, and direction of ploughing.
Step 1: The line of pull affects the working stability of the plough.
Step 2: If the plough is not properly aligned, it may move sideways or fail to cut the soil uniformly.
Step 3: A horizontal clevis is used to make lateral adjustment of the plough.
Step 4: This adjustment helps align the plough properly with the line of pull.
Step 5: Therefore, the correct device is horizontal clevis.
\[
\boxed{\text{Horizontal clevis}}
\]