Swivel-Lock Driving Head includes the driving head only for our swivel-head stretcher. The swivel head has 60° of free swivel for patterned carpet. Depress the built-in lock pin, and you can lock the swivel in 5 positions. Lock in the straight position for square stretching, or at 15° for most angle stretching. There’s even a 30° setting for extreme angles found in “L” shaped living/dining rooms. The push-button stretch lock is conveniently located on the handle for partial stretches. Pin depth is adjusted with two screws in the depth bar of the pin plate. Back to Carpet Stretcher.