Quote: (Originally Posted by
Ben Field)

...the kind of buoyancy tubes heavy camera housings use for trim...
Already done...
I have used the (clear) OMS emergency tube to adjust trim in the past. However, just bought some really-nice (black

) Gates positive trim tubes for their cameras.
Of course, in the Summer here, I dive with skin or 3mm when shallow so don't want to lift extra trim weight unneccessary as the rig is already enough to sink.