The Axion comprises of the base housing, curved rail and ball on a stem. The Axion is an interface mounted between the head support pad and the head support mounting hardware.
The rail rotates through the base and with the head support. The base remains stationary. The knob underneath permits locking out the rotation and can be engaged at any position on the rail.
There are two rotation ranges, 90 or 60 degrees.
The Axion-90 rail is longer than the Axion-60 rail. This longer rail may project beyond the edge of smaller headrests. If in doubt, choose the Axion-60 series.
The rotation is 30° each way for the Axion-60 and 45° each way for the Axion-90.