{HEAD ~ The cavity} of the rotary button 1 serves for accommodating {TAIL ~ the bearing} for displacing 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 
serves for accommodating
{ HEAD ~ The cavity } of the rotary button 1 serves for accommodating { TAIL ~ the bearing } for displacing 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
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL 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 OTH OTH OTH OTH