The case backs don’t just ‘pop off’, they are copies of the gen Niadlock, so twist off with gasket. They are not as secure as a gen, and can be twisted with off easily without tools, and my ORF gasket was dry so I applied silicone to it. The movement is decorated, but nowhere near as well decorated as the VSF. I think a thicker gasket would work, but I certainly won’t be swimming with it!