I needed an extra hole for a radio flash trigger cable in my D800 housing. I trigger two Inon Z240s with optical cables but the single flash bulkhead is filled with a Leak Sentinel. I figured I don't really need the control which changes metering from matrix, centre-weighted and spot, so maybe I could use that as a cable entry? But then you run into the problem of running a cable from the back of the housing to the camera in the front. Which is tricky. But the Leak Sentinel can be anywhere in the housing... The metering control gland has a 10mm coarse thread on it.
Remove the control by levering off the plastic disk on top of the control knob which exposes an Allen head machine screw. Remove this, and the knob. If you now remove the gland using circlip pliers, you will be able to remove the control rod inside without removing any of the adjacent control which otherwise gets in the way.
I had an old Leak Sentinel and took this and a 10mm coarse thread hex machine screw to a local workshop. They cut an o-ring groove under the head of the bolt, rounded it off, cut the part from the Leak Sentinet the right length (12mm) and welded the bits together. A hole drilled through the bolt allows the housing to be evacuated through this fitting. It cost ten quid.
I had an old Nikonos socket with the 16mm thread that screws directly into the bulkead hole in the front part of the housing and this is where I will wire a coil cable with a floating box with a radio trigger for topside flashes. Inside the housing I will have a cable running to the hotshoe or the X-sync socket of the camera.
The Leak Sentinel seems fine in the new position but the fitting could have been made a bit shorter without the Leak Sentinel interefering with the housing.
