Sony 6116.12 RX100 III Instruction Manual page 24

Control Maintenance -
In the unlikely event one of the larger gland style control shafts sticks or
becomes difficult to operate, you can remove the control from the
housing and lubricate it, or return the housing to Ikelite for maintenance.
To remove the control, Diagram F, loosen the set screw in the knob
(allen wrench required); remove the knob. If there is salt or dirt build-up
on the exposed control shaft, clean the shaft. Open the housing and
gently slide the control shaft out of the control gland. Clean and lightly
lubricate the shaft, including the end of the shaft.
Slide the shaft back into the control gland and gently slide it back and
forth a few times without fully removing the shaft from the gland.
Replace the knob, noting the flat area on the shaft. The set screw in the
knob should tighten down against the flat area on the control so the
knob does not turn on the shaft.
After completing this procedure, close the housing and submerge it in
water without the camera inside. Check the control for watertightness.
Control Shaft
Tighten set screw down
against this flat area
when replacing the knob.
24
continued
Diagram F
Housing
Lubricate end of shaft
before reinserting into
gland
Gland
Loosen set screw
(allen wrench supplied)