The cavity of the rotary button 1 serves for accommodating the bearing for displacing {TAIL ~ the rotary button} 1 in a plane perpendicular to its axis of rotation, which approximately lies in the plane of {HEAD ~ the page} of FIG 1 
The cavity of the rotary button 1 serves for accommodating the bearing for displacing { TAIL ~ the rotary button } 1 in a plane perpendicular to its axis of rotation , which approximately lies in the plane of { HEAD ~ the page } of FIG 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH