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