Between stretches along the same wall, the head of a power stretcher should not be moved more than:

The head of a power stretcher should not be moved more than the width of the head of the stretcher between stretches along the same wall. This limitation is in place to maintain the integrity of the carpet stretching process. Moving this distance ensures that the carpet remains adequately taut and does not risk becoming loose or improperly aligned.

When the head is moved beyond this distance, it could lead to inadequate stretching, potentially resulting in wrinkles or buckling in the carpet. The width of the head acts as a guideline, reflecting the operational effectiveness of the power stretcher and ensuring that the stretching process is efficient and achieves the desired results without damaging the carpet or compromising the installation quality.

Other options do not appropriately define the correct limitations for moving the head of the stretcher. For instance, the length of the blanket or the height of the stretcher does not directly correlate to effective stretching practices. The width of the carpet also doesn’t adequately signify the maximum distance for adjustment, as the stretcher's head needs precise positioning to maintain proper stretch along the edges or seams of the carpet being installed.