Apart from {HEAD ~ the rotary adjustment} about {TAIL ~ the axis} of rotation, a switching function can be provided by moving the rotary button in a direction parallel relative to the axis of rotation 
about
Apart from { HEAD ~ the rotary adjustment } about { TAIL ~ the axis } of rotation , a switching function can be provided by moving the rotary button in a direction parallel relative to the axis of rotation
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH