JJC RN-LX3 Custom Mechanical Cable Release Adapter for Panasonic Lumix LX3/LX5 & LEICA D-LUX4/LUX5
This is the adapter for the Panasonic LX3/LX5 & LEICA D-LUX4/LUX5, it uses the camera's hot shoe cover as a solid base for the mechanical cable release. You can't use an external flash at the same time as a cable release, but it's not flash photography that you want a cable release for in the first place.
The cable release is not included, so you can buy the length(s) you need or use one you already own.
The cable release works with original Nikon AR-3 (or similar standard) mechanical shutter release cable.