The cavity of the rotary button 1 serves for accommodating {HEAD ~ 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 the page of FIG 1 
for displacing
The cavity of the rotary button 1 serves for accommodating { HEAD ~ 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 the page of FIG 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL 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 OTH OTH OTH OTH OTH