The invention contemplates a precisely adjustable threaded mechanism, as for focus adjustment of an aerial camera lens, wherein {HEAD ~ inner and outer threaded members} are normally in {TAIL ~ circumferentially continuous radially stressed play free engagement} to the extent of requiring a characteristic maximum torque for their rotary adjustment 
are normally in
The invention contemplates a precisely adjustable threaded mechanism , as for focus adjustment of an aerial camera lens , wherein { HEAD ~ inner and outer threaded members } are normally in { TAIL ~ circumferentially continuous radially stressed play free engagement } to the extent of requiring a characteristic maximum torque for their rotary adjustment
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH