Itīs apparently a very massive piece made of steel
The one showed in mfr website for 4700 is not the cylindrical shape. (see my post #417)
They are using the same case now for CVR/FDR memory. And proved successful.
We need ASAP better ULBīs. Being addressed presently.
And "last but not least" better AS sensors. The 38 cases with machines so dependent on itīs data is a proof of a "slow motion" kind of bureaucracy.
Still for some time giving chances to "Murphy Law".